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Artículos de revistas sobre el tema "Clock transition spectroscopy"

Autor: Grafiati
Publicado: 10 de marzo de 2023
Última modificación: 31 de julio de 2025

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1

Telnov, Evgeny, Petr Borisyuk, Dmitry Tregubov, Daniil Provorchenko, Konstantin Trichev, and Pavel Cherepanov. "Registration of a Quadrupole Transition in High-Energy 88Sr+ Ions Obtained by Laser Ablation Method." Photonics 11, no. 4 (2024): 337. http://dx.doi.org/10.3390/photonics11040337.

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In this paper, we demonstrate the interaction of 674 nm laser radiation with a clock quadrupole transition in high-energy 88Sr+ ions obtained by laser ablation. The results of the spectrometry of the clock and the pump transitions are presented. We describe the parameters of the experimental setup and the protocol of the clock transition spectroscopy and analyze various line broadening mechanisms.
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2

Sun, Yuxin, Yuan Yao, Yaqin Hao, Hongfu Yu, Yanyi Jiang, and Longsheng Ma. "Laser stabilizing to ytterbium clock transition with Rabi and Ramsey spectroscopy." Chinese Optics Letters 18, no. 7 (2020): 070201. http://dx.doi.org/10.3788/col202018.070201.

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3

Guo Feng, 郭峰, 孔德欢 Kong Dehuan, 张强 Zhang Qiang, 王叶兵 Wang Yebing, and 常宏 Chang Hong. "System Development and Clock Transition Spectroscopy Detection of Transportable 87Sr Optical Clock." Acta Optica Sinica 40, no. 9 (2020): 0902001. http://dx.doi.org/10.3788/aos202040.0902001.

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4

Milner, William R., Stefan Lannig, Mikhail Mamaev, et al. "Coherent evolution of superexchange interaction in seconds-long optical clock spectroscopy." Science 388, no. 6746 (2025): 503–8. https://doi.org/10.1126/science.ado5987.

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Scaling up the performance of atomic clocks requires understanding complex many-body Hamiltonians to ensure meaningful gains for metrological applications. Here we use a degenerate Fermi gas loaded into a three-dimensional optical lattice to study the effect of a tunable Fermi-Hubbard Hamiltonian. The clock laser introduces a spin-orbit coupling spiral phase and breaks the isotropy of superexchange interactions, leading to XXZ-type spin anisotropy. By tuning the lattice confinement and applying imaging spectroscopy, we map out favorable atomic coherence regimes. We transition through various i
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5

Wang, Yebing, Xiaotong Lu, Benquan Lu, Dehuan Kong, and Hong Chang. "Recent Advances Concerning the 87Sr Optical Lattice Clock at the National Time Service Center." Applied Sciences 8, no. 11 (2018): 2194. http://dx.doi.org/10.3390/app8112194.

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We review recent experimental progress concerning the 87Sr optical lattice clock at the National Time Service Center in China. Hertz-level spectroscopy of the 87Sr clock transition for the optical lattice clock was performed, and closed-loop operation of the optical lattice clock was realized. A fractional frequency instability of 2.8 × 10−17 was attained for an averaging time of 2000 s. The Allan deviation is found to be 1.6 × 10−15/τ1/2 and is limited mainly by white-frequency-noise. The Landé g-factors of the (5s2)1S0 and (5s5p)3P0 states in 87Sr were measured experimentally; they are impor
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6

Bober, M., J. Zachorowski, W. Gawlik, et al. "Precision spectroscopy of cold strontium atoms, towards optical atomic clock." Bulletin of the Polish Academy of Sciences: Technical Sciences 60, no. 4 (2012): 707–10. http://dx.doi.org/10.2478/v10175-012-0082-x.

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Abstract This report concerns the experiment of precision spectroscopy of cold strontium atoms in the Polish National Laboratory of Atomic, Molecular and Optical Physics in Toruń. The system is composed of a Zeeman slower and magneto-optical traps (at 461 nm and 689 nm), a frequency comb, and a narrow-band laser locked to an ultra-stable optical cavity. All parts of the experiment are prepared and the first measurements of the absolute frequency of the 1S0-3P1, 689 nm optical transition in 88Sr atoms are performed.
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7

YE, JUN, SEBASTIAN BLATT, MARTIN M. BOYD, et al. "PRECISION MEASUREMENT BASED ON ULTRACOLD ATOMS AND COLD MOLECULES." International Journal of Modern Physics D 16, no. 12b (2007): 2481–94. http://dx.doi.org/10.1142/s0218271807011826.

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Ultracold atoms and molecules provide ideal stages for precision tests of fundamental physics. With microkelvin neutral strontium atoms confined in an optical lattice, we have achieved a fractional resolution of 4 × 10-15 on the 1S0–3P0 doubly forbidden 87 Sr clock transition at 698 nm. Measurements of the clock line shifts as a function of experimental parameters indicate systematic errors below the 10-15 level. The ultrahigh spectral resolution permits resolving the nuclear spin states of the clock transition at small magnetic fields, leading to measurements of the 3P0 magnetic moment and me
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8

Arata, Toshiaki. "Myosin and Other Energy-Transducing ATPases: Structural Dynamics Studied by Electron Paramagnetic Resonance." International Journal of Molecular Sciences 21, no. 2 (2020): 672. http://dx.doi.org/10.3390/ijms21020672.

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The objective of this article was to document the energy-transducing and regulatory interactions in supramolecular complexes such as motor, pump, and clock ATPases. The dynamics and structural features were characterized by motion and distance measurements using spin-labeling electron paramagnetic resonance (EPR) spectroscopy. In particular, we focused on myosin ATPase with actin–troponin–tropomyosin, neural kinesin ATPase with microtubule, P-type ion-motive ATPase, and cyanobacterial clock ATPase. Finally, we have described the relationships or common principles among the molecular mechanisms
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9

Yudin, V. I., A. V. Taichenachev, O. N. Prudnikov, et al. "Optical Clock Based on Two-Photon Spectroscopy of the Nuclear Transition in a 229Th Ion in a Monochromatic Field." JETP Letters 121, no. 5 (2025): 345–53. https://doi.org/10.1134/s0021364025600090.

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The possibility of two-photon laser spectroscopy of the nuclear clock transition (148.38 nm) in the 229Th isotope has been investigated using an intense monochromatic laser field at twice the wavelength (296.76 nm). Our estimates show that due to the electron bridge process in the doubly ionized ion 229Th2+ the sufficient intensity of a continuous laser field is about 10–100 kW/cm2, which is within the reach of modern laser systems. This unique possibility is an result of the presence in the electronic spectrum of the ion 229Th2+ of an exceptionally close intermediate (for the two-photon trans
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10

Gribov, A. Y., O. I. Berdasov, G. S. Belotelov, E. F. Stelmashenko, D. V. Sutyrin, and S. N. Slyusarev. "The optical frequency standard based on strontium cold atoms." Izmeritel`naya Tekhnika, no. 12 (2020): 22–27. http://dx.doi.org/10.32446/0368-1025it.2020-12-22-27.

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The results obtained during the development of an optical frequency standard, based on cold 87Sr atoms are presented. The parameters of experimental optical schemes developed for the realization of all stages of sequential laser cooling and trapping of 87Sr atoms into an optical lattice are described. Clock transition spectroscopy was successfully performed with a spectral transition linewidth of 12 Hz. A measuring scheme based on a femtosecond optical frequency synthesizer has been developed, which makes it possible to compare the optical standard with a hydrogen maser. The created optical fr
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11

Berdasov, O. I., A. Yu Gribov, G. S. Belotelov, et al. "Ultrastable laser system for spectroscopy of the 1S0 – 3P0 clock transition in Sr atoms." Quantum Electronics 47, no. 5 (2017): 400–405. http://dx.doi.org/10.1070/qel16346.

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12

Marmet, L., and A. A. Madej. "Optical Ramsey spectroscopy and coherence measurements of the clock transition in a single trapped Sr ion." Canadian Journal of Physics 78, no. 5-6 (2000): 495–507. http://dx.doi.org/10.1139/p00-027.

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We report on the observation of coherent excitation and spectroscopy performed using Ramsey's method of separated excitation fields on a single trapped and laser cooled ion of strontium. Single pulse Rabi excitation studies of the ion have shown linewidths approaching the transform limited value. Studies of transition rate versus pulse duration have shown a quadratic initial increase in transition rate with a duration consistent with coherent excitation and a rapid loss of Rabi oscillations, consistent with the concept of a dephasing of the thermally populated trap oscillator states as the exc
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13

Wolf, Anne Lisa, Jonas Morgenweg, Jeroen C. J. Koelemeij, Steven A. van den Berg, Wim Ubachs, and Kjeld S. E. Eikema. "Direct frequency-comb spectroscopy of a dipole-forbidden clock transition in trapped Ca^+40 ions." Optics Letters 36, no. 1 (2010): 49. http://dx.doi.org/10.1364/ol.36.000049.

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14

Chepurov, S. V., A. A. Lugovoy, O. N. Prudnikov, A. V. Taichenachev, and S. N. Bagayev. "Spectroscopy of the quadrupole clock transition of ytterbium-171 ions for optical frequency standard development." Quantum Electronics 49, no. 5 (2019): 412–17. http://dx.doi.org/10.1070/qel16996.

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15

Fedorova, E. S., D. O. Tregubov, A. A. Golovizin, et al. "Rabi spectroscopy of the clock transition in thulium atoms in a one-dimensional optical lattice." Quantum Electronics 50, no. 3 (2020): 220–24. http://dx.doi.org/10.1070/qel17259.

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16

MA Zixiao, ZHANG Baolin, HUANG Yao, GAO Kelin, and GUAN Hua. "Characterization of secular motion and excess micromotion in a Liquid Nitrogen-Cooled Ca<sup>+</sup> Ion Optical Clock." Acta Physica Sinica 74, no. 9 (2025): 0. https://doi.org/10.7498/aps.74.20250048.

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In ion optical clock systems, the motional effects of trapped ions are critical factors in determining clock performance and currently represent key limitations in achieving lower uncertainty across different ion-based optical clocks. Building on the first liquid nitrogen-cooled Ca$^+$ ion optical clock [PhysRevApplied.17.034041], we have developed a new physical system for a second Ca$^+$ ion optical clock and made significant improvements to its ion trapping apparatus. These improvements primarily focus on two aspects: First, we designed and implemented an active stabilization system for the
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17

Schröter, Christian, Jong Chan Lee, and Thomas Schultz. "Mass-correlated rotational Raman spectra with high resolution, broad bandwidth, and absolute frequency accuracy." Proceedings of the National Academy of Sciences 115, no. 20 (2018): 5072–76. http://dx.doi.org/10.1073/pnas.1721756115.

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We present mass-correlated rotational alignment spectroscopy, based on the optical excitation of a coherent rotational quantum wave and the observation of temporal wave interferences in a mass spectrometer. Combined electronic and opto-mechanical delays increased the observation time and energy resolution by an order of magnitude compared with preceding time-domain measurements. Rotational transition frequencies were referenced to an external clock for accurate absolute frequency measurements. Rotational Raman spectra for six naturally occurring carbon disulfide isotopologues were resolved wit
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18

Scharl, Kevin, Shiqian Ding, Georg Holthoff, et al. "Setup for the Ionic Lifetime Measurement of the 229mTh3+ Nuclear Clock Isomer." Atoms 11, no. 7 (2023): 108. http://dx.doi.org/10.3390/atoms11070108.

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For the realization of an optical nuclear clock, the first isomeric excited state of thorium-229 (229mTh) is currently the only candidate due to its exceptionally low-lying excitation energy (8.338±0.024 eV). Such a nuclear clock holds promise not only to be a very precise metrological device but also to extend the knowledge of fundamental physics studies, such as dark matter research or variations in fundamental constants. Considerable progress was achieved in recent years in characterizing 229mTh from its first direct identification in 2016 to the only recent observation of the long-sought-a
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19

Akamatsu, Daisuke, Hajime Inaba, Kazumoto Hosaka, et al. "Spectroscopy and frequency measurement of the87Sr clock transition by laser linewidth transfer using an optical frequency comb." Applied Physics Express 7, no. 1 (2013): 012401. http://dx.doi.org/10.7567/apex.7.012401.

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20

Pimon, Martin, Andreas Grüneis, Peter Mohn, and Thorsten Schumm. "Ab-Initio Study of Calcium Fluoride Doped with Heavy Isotopes." Crystals 12, no. 8 (2022): 1128. http://dx.doi.org/10.3390/cryst12081128.

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Precision laser spectroscopy of the 229-thorium nuclear isomer transition in a solid-state environment would represent a significant milestone in the field of metrology, opening the door to the realization of a nuclear clock. Working toward this goal, experimental methods require knowledge of various properties of a large band-gap material, such as calcium fluoride doped with specific isotopes of the heavy elements thorium, actinium, cerium, neptunium, and uranium. By accurately determining the atomic structure of potential charge compensation schemes by using a generalized gradient approximat
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21

Park, S., A. E. Mironov, J. Kim, S.-J. Park, and J. G. Eden. "194 nm microplasma lamps driven by excitation transfer: optical sources for the 199Hg ion atomic clock and photochemistry." Plasma Sources Science and Technology 31, no. 4 (2022): 045007. http://dx.doi.org/10.1088/1361-6595/ac5c5c.

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Abstract A series of miniature, microcavity plasma lamps emitting predominantly at 194 nm has been successfully developed and tested as the optical pump for the microwave 199Hg-ion atomic clock (40.507 GHz), replacing low pressure, RF-powered Ar/Hg discharges. Intense fluorescence on the 6p 2P1/2 → 6s 2S1/2 transition of the singly-charged 202Hg ion at 194.23 nm has been generated in arrays of cylindrical microplasmas through electron-impact excitation of He, followed by three-body formation of He2(a 3 Σ u + ) and Penning ionization of Hg. Emission spectroscopy and kinetic modeling of He/Hg va
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22

Jakubowicz, Daniela, Rachel Chava Rosenblum, Julio Wainstein, and Orit Twito. "Influence of Fasting until Noon (Extended Postabsorptive State) on Clock Gene mRNA Expression and Regulation of Body Weight and Glucose Metabolism." International Journal of Molecular Sciences 24, no. 8 (2023): 7154. http://dx.doi.org/10.3390/ijms24087154.

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The trend of fasting until noon (omission or delayed breakfast) is increasingly prevalent in modern society. This eating pattern triggers discordance between endogenous circadian clock rhythms and the feeding/fasting cycle and is associated with an increased incidence of obesity and T2D. Although the underlying mechanism of this association is not well understood, growing evidence suggests that fasting until noon, also known as an “extended postabsorptive state”, has the potential to cause a deleterious effect on clock gene expression and to disrupt regulation of body weight, postprandial and
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23

Wu, Bin, Zhaoying Wang, Bing Cheng, et al. "Experimental verification of the Breit–Rabi formula in the case of clock transition by using the spectroscopy method." Journal of the Optical Society of America B 31, no. 4 (2014): 742. http://dx.doi.org/10.1364/josab.31.000742.

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24

Lee, Yool, and Alfian Shan Tanggono. "Potential Role of the Circadian Clock in the Regulation of Cancer Stem Cells and Cancer Therapy." International Journal of Molecular Sciences 23, no. 22 (2022): 14181. http://dx.doi.org/10.3390/ijms232214181.

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Circadian rhythms, including sleep/wake cycles as well as hormonal, immune, metabolic, and cell proliferation rhythms, are fundamental biological processes driven by a cellular time-keeping system called the circadian clock. Disruptions in these rhythms due to genetic alterations or irregular lifestyles cause fundamental changes in physiology, from metabolism to cellular proliferation and differentiation, resulting in pathological consequences including cancer. Cancer cells are not uniform and static but exist as different subtypes with phenotypic and functional differences in the tumor microe
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25

Golovizin, A., V. Bushmakin, S. Fedorov та ін. "Ultrastable Laser System for Spectroscopy of the 1.14 μm Inner-Shell Clock Transition in Tm and Its Absolute Frequency Measurement". Journal of Russian Laser Research 40, № 6 (2019): 540–46. http://dx.doi.org/10.1007/s10946-019-09835-y.

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26

Zhang, Yuan, Aurore Devocelle, Christophe Desterke, et al. "BMAL1 Knockdown Leans Epithelial–Mesenchymal Balance toward Epithelial Properties and Decreases the Chemoresistance of Colon Carcinoma Cells." International Journal of Molecular Sciences 22, no. 10 (2021): 5247. http://dx.doi.org/10.3390/ijms22105247.

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The circadian clock coordinates biological and physiological functions to day/night cycles. The perturbation of the circadian clock increases cancer risk and affects cancer progression. Here, we studied how BMAL1 knockdown (BMAL1-KD) by shRNA affects the epithelial–mesenchymal transition (EMT), a critical early event in the invasion and metastasis of colorectal carcinoma (CRC). In corresponding to a gene set enrichment analysis, which showed a significant enrichment of EMT and invasive signatures in BMAL1_high CRC patients as compared to BMAL1_low CRC patients, our results revealed that BMAL1
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27

Giri, G. S., O. O. Versolato, L. W. Wansbeek, et al. "Precision spectroscopy of trapped radioactive radium ions This paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010." Canadian Journal of Physics 89, no. 1 (2011): 69–72. http://dx.doi.org/10.1139/p10-089.

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Atomic parity violation (APV) can be measured in a single Ra+ ion, enabling a precise measurement of the electroweak mixing angle in the Standard Model of particle physics at low momentum transfer. This provides sensitivity to new particles such as extra Z0 bosons or leptoquarks. The Weinberg angle can be measured via a determination of the light shift in the forbidden 72S1/2–62D3/2 transition in a single trapped Ra+. Ultra-narrow transitions in such an ideal system can also be exploited to realize a high stability frequency standard. At the TRIμP facility of KVI, we have succeeded in the prod
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28

Pu, Xiaojun, Lixin Yang, Lina Liu, et al. "Genome-Wide Analysis of the MYB Transcription Factor Superfamily in Physcomitrella patens." International Journal of Molecular Sciences 21, no. 3 (2020): 975. http://dx.doi.org/10.3390/ijms21030975.

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MYB transcription factors (TFs) are one of the largest TF families in plants to regulate numerous biological processes. However, our knowledge of the MYB family in Physcomitrella patens is limited. We identified 116 MYB genes in the P. patens genome, which were classified into the R2R3-MYB, R1R2R3-MYB, 4R-MYB, and MYB-related subfamilies. Most R2R3 genes contain 3 exons and 2 introns, whereas R1R2R3 MYB genes contain 10 exons and 9 introns. N3R-MYB (novel 3RMYB) and NR-MYBs (novel RMYBs) with complicated gene structures appear to be novel MYB proteins. In addition, we found that the diversity
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29

He, Xin, Tianyi Wang, Wan Zhu, Yujing Wang, and Longfu Zhu. "GhHB12, a HD-ZIP I Transcription Factor, Negatively Regulates the Cotton Resistance to Verticillium dahliae." International Journal of Molecular Sciences 19, no. 12 (2018): 3997. http://dx.doi.org/10.3390/ijms19123997.

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The homeodomain-leucine zipper (HD-ZIP) is a plant-specific transcription factor family that plays important roles in plant developmental processes in response to multiple stressors. We previously isolated a cotton HD-ZIP class I transcription factor gene, GhHB12, which is regulated by the circadian clock and photoperiodism. Furthermore, it regulates cotton architecture, phase transition, and photoperiod sensitivity. Here we report that GhHB12 was induced by methyl jasmonate (MeJA) and Verticillium dahliae infection. Additionally, stress-responsive elements were found in the GhHB12 promoter. P
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30

Mukaiyama, Atsushi, and Shuji Akiyama. "3P054 Conformational transition of a cyanobacterial clock protein KaiC monitored with fluorescence spectroscopy(01C. Protein: Property,Poster,The 52nd Annual Meeting of the Biophysical Society of Japan(BSJ2014))." Seibutsu Butsuri 54, supplement1-2 (2014): S257. http://dx.doi.org/10.2142/biophys.54.s257_6.

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31

Khabarova, Ksenia, Denis Kryuchkov, Alexander Borisenko, et al. "Toward a New Generation of Compact Transportable Yb+ Optical Clocks." Symmetry 14, no. 10 (2022): 2213. http://dx.doi.org/10.3390/sym14102213.

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Optical atomic clocks are currently one of the most sensitive tools making it possible to precisely test the fundamental symmetry properties of spacetime and Einstein’s theory of relativity. At the same time, the extremely high stability and accuracy of compact transportable optical clocks open new perspectives in important fields, such as satellite navigation, relativistic geodesy, and the global time and frequency network. Our project aimed to develop a compact transportable optical clock based on a single ytterbium ion. We present the first prototype of the Yb+ clock (298 kg in 1 m3) and pr
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32

López-Juárez, Zaira M., Laura Aguilar-Henonin, and Plinio Guzmán. "The ATXN2 Orthologs CID3 and CID4, Act Redundantly to In-Fluence Developmental Pathways throughout the Life Cycle of Arabidopsis thaliana." International Journal of Molecular Sciences 22, no. 6 (2021): 3068. http://dx.doi.org/10.3390/ijms22063068.

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RNA-binding proteins (RBPs) are key elements involved in post-transcriptional regulation. Ataxin-2 (ATXN2) is an evolutionarily conserved RBP protein, whose function has been studied in several model organisms, from Saccharomyces cerevisiae to the Homo sapiens. ATXN2 interacts with poly(A) binding proteins (PABP) and binds to specific sequences at the 3′UTR of target mRNAs to stabilize them. CTC-Interacting Domain3 (CID3) and CID4 are two ATXN2 orthologs present in plant genomes whose function is unknown. In the present study, phenotypical and transcriptome profiling were used to examine the r
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33

Brenna, Andrea, and Claudio Talora. "WC-1 and the Proximal GATA Sequence Mediate a Cis-/Trans-Acting Repressive Regulation of Light-Dependent Gene Transcription in the Dark." International Journal of Molecular Sciences 20, no. 12 (2019): 2854. http://dx.doi.org/10.3390/ijms20122854.

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Light influences a wide range of physiological processes from prokaryotes to mammals. Neurospora crassa represents an important model system used for studying this signal pathway. At molecular levels, the WHITE COLLAR Complex (WCC), a heterodimer formed by WC-1 (the blue light photo-sensor) and WC-2 (the transcriptional activator), is the critical positive regulator of light-dependent gene expression. GATN (N indicates any other nucleotide) repeats are consensus sequences within the promoters of light-dependent genes recognized by the WCC. The distal GATN is also known as C-box since it is inv
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34

Bossen, Judith, Ruben Prange, Jan-Philip Kühle, et al. "Adult and Larval Tracheal Systems Exhibit Different Molecular Architectures in Drosophila." International Journal of Molecular Sciences 24, no. 6 (2023): 5628. http://dx.doi.org/10.3390/ijms24065628.

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Knowing the molecular makeup of an organ system is required for its in-depth understanding. We analyzed the molecular repertoire of the adult tracheal system of the fruit fly Drosophila melanogaster using transcriptome studies to advance our knowledge of the adult insect tracheal system. Comparing this to the larval tracheal system revealed several major differences that likely influence organ function. During the transition from larval to adult tracheal system, a shift in the expression of genes responsible for the formation of cuticular structure occurs. This change in transcript composition
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35

Yudin, V. I., A. V. Taichenachev, M. Yu Basalaev, et al. "Combined error signal in Ramsey spectroscopy of clock transitions." New Journal of Physics 20, no. 12 (2018): 123016. http://dx.doi.org/10.1088/1367-2630/aaf47c.

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36

Hodges, J. T., K. Bielska, M. Birk, et al. "International comparison CCQM-P229 pilot study to measure line intensities of selected 12C16O transitions." Metrologia 62, no. 1A (2025): 08006. https://doi.org/10.1088/0026-1394/62/1a/08006.

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Main text We present primary spectroscopic measurements of line intensities in the 3-0 vibrational band of 12C16O. This international measurement campaign was organized under the auspices of the Consultative Committee for Amount of Substance (CCQM) and involved six laboratories carrying out independent measurements of more than forty rotation-vibration transitions. A total of three measurement techniques on samples of pure carbon monoxide were applied in this intercomparison, including Fourier transform spectroscopy, cavity ring-down spectroscopy, and cavity mode dispersion spectroscopy. Using
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37

Najafian, Kaveh, Ziv Meir, and Stefan Willitsch. "From megahertz to terahertz qubits encoded in molecular ions: theoretical analysis of dipole-forbidden spectroscopic transitions in N2+." Physical Chemistry Chemical Physics 22, no. 40 (2020): 23083–98. http://dx.doi.org/10.1039/d0cp03906c.

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38

Siebert, Ronald, Florian Schlütter, Andreas Winter, et al. "Ruthenium(II)-bis(4′-(4-ethynylphenyl)-2,2′:6′, 2″-terpyridine) — A versatile synthon in supramolecular chemistry. Synthesis and characterization." Open Chemistry 9, no. 6 (2011): 990–99. http://dx.doi.org/10.2478/s11532-011-0087-6.

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AbstractA homoleptic ethynyl-substituted ruthenium(II)-bisterpyridine complex representing a versatile synthon in supramolecular chemistry was synthesized and analyzed by NMR spectroscopy, mass spectrometry and X-ray diffractometry. Furthermore, its photophysical properties were detailed by UV/Vis absorption, emission and resonance Raman spectroscopy. In order to place the results obtained in the context of the vast family of ruthenium coordination compounds, two structurally related complexes were investigated accordingly. These reference compounds bear either no or an increased chromophore i
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39

Taichenachev, A. V., V. I. Yudin, C. W. Oates, et al. "Compensation of field-induced frequency shifts in Ramsey spectroscopy of optical clock transitions." JETP Letters 90, no. 11 (2010): 713–17. http://dx.doi.org/10.1134/s0021364009230052.

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40

Mukaiyama, Atsushi, Yusuke Matsui, Takao Kondo, and Shuji Akiyama. "3P039 Tracking conformational transitions of a circadian clock protein, KaiC using time-resolved spectroscopic techniques(Protein: Structure & Function,The 48th Annual Meeting of the Biophysical Society of Japan)." Seibutsu Butsuri 50, supplement2 (2010): S151—S152. http://dx.doi.org/10.2142/biophys.50.s151_6.

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41

Akin, T. G., Bryan Hemingway, and Steven Peil. "Tellurium spectrometer for 1S0–1P1 transitions in strontium and other alkaline-earth atoms." Review of Scientific Instruments 93, no. 5 (2022): 053002. http://dx.doi.org/10.1063/5.0084122.

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We measure the spectrum of tellurium-130 in the vicinity of the 461 nm [Formula: see text] cycling transition in neutral strontium, a popular element for atomic clocks, quantum information, and quantum-degenerate gases. The lack of hyperfine structure in tellurium results in a spectral density of transitions nearly 50 times lower than that available in iodine, making use of tellurium as a laser-frequency reference challenging. By frequency-offset locking two lasers, we generate the large frequency shifts required to span the difference between a tellurium line and the [Formula: see text] reson
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42

Novotny, C., B. Bernhardt, D. Bing, et al. "Towards a precision test of time dilation at high velocityThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at University of Windsor, Windsor, Ontario, Canada on 21–26 July 2008." Canadian Journal of Physics 87, no. 7 (2009): 749–56. http://dx.doi.org/10.1139/p08-149.

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We report on first measurements towards an Ives–Stilwell test of time dilation at velocities around 0.3c. In Ives–Stilwell type experiments, fast atomic ions containing a well-known transition are used as moving clocks, and time dilation as well as the velocity can be derived from the simultaneous laser-spectroscopic measurements of the Doppler shifts with and against the direction of motion. To accurately measure these Doppler shifts, the Doppler broadening caused by the ions velocity distribution needs to be overcome. We performed first feasibility studies for laser spectroscopy on 7Li+ ions
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43

Yu, Yang, Yuzhen Zhao, Yongsheng Mi, et al. "Exploration of Optical Properties of Novel Pyrene Derivatives Modified by Click Functionalization." Crystals 12, no. 9 (2022): 1295. http://dx.doi.org/10.3390/cryst12091295.

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A simple synthetic method was designed, in which the Sonogashira coupling reaction and [2+2] cycloaddition click reaction with high yield were performed on 1-bromopyrene to obtain several novel pyrene derivatives. The structure of each sample was characterized by Nuclear Magnetic Resonance (NMR), Mass Spectrometry (MS), Fourier transform infrared (FTIR) and elemental analysis. The characterization of the products by Ultraviolet-visible (UV-vis) and Photoluminescence (PL) spectroscopy proves that the addition of click groups has an important effect on the optoelectronic properties of pyrene der
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44

Sánchez-Bodón, Julia, Maria Diaz-Galbarriatu, Leyre Pérez-Álvarez, José Luis Vilas-Vilela, and Isabel Moreno-Benítez. "Expanding (Bio)Conjugation Strategies: Metal-Free Thiol-Yne Photo-Click Reaction for Immobilization onto PLLA Surfaces." Coatings 14, no. 7 (2024): 839. http://dx.doi.org/10.3390/coatings14070839.

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The study delves into the use of the thiol-yne click reaction to enhance (bio)conjugation methodologies, particularly focusing on immobilizing biomolecules onto PLLA surfaces. The thiol-yne click reaction, known for its efficiency, selectivity, and versatility in forming carbon-sulfur bonds under mild conditions without transition metal catalysts, is explored for conjugating the fluorophore dansyl onto PLLA surfaces. This approach aims to broaden bioconjugation strategies beyond traditional methods like the Michael-type reaction, expanding their applicability to diverse biomolecules. Utilizing
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45

Huang, Zichen, Fan Chen, Qi Wang, Dingxiang Zhang, Hongdong Wang, and Xiacong Zhang. "Facile Synthesis of Thermoresponsive Alternating Copolymers with Tunable Phase-Transition Temperatures." Polymers 16, no. 24 (2024): 3470. https://doi.org/10.3390/polym16243470.

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A series of novel amphiphilic alternating CPEG copolymers were synthesized through an amine–epoxy click reaction comprising aliphatic amine and polyethylene glycol diglycidyl ether (PEGDE). These polymers were characterized in detail via nuclear magnetic resonance (NMR), gel permeation chromatography (GPC), Fourier-transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA) to confirm the successful synthesis. Due to their amphiphilic structure, these polymers display thermoresponsiveness, with tunable cloud points (Tcps) that are adjustable from 20.8 °C to 46.8 °C by altering
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46

Hosseinnejad, Tayebeh, Fatemeh Ebrahimpour-Malmir, and Bahareh Fattahi. "Computational investigations of click-derived 1,2,3-triazoles as keystone ligands for complexation with transition metals: a review." RSC Advances 8, no. 22 (2018): 12232–59. http://dx.doi.org/10.1039/c8ra00283e.

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1,2,3-Triazole based ligands and their complexes with transition metals are used in pharmaceuticals and catalysis. Here we assess recent computational research on the structural, electronic and spectroscopic properties of these complexes.
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47

Zhang, Wenzheng, Ning Jiang, and Tingting Zhang. "Self-plasticization of neoprene rubber via click chemistry from environmentally sustainable cardanol." Journal of Elastomers & Plastics 52, no. 6 (2019): 483–94. http://dx.doi.org/10.1177/0095244319869768.

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The sustainable biomass cardanol grafting onto neoprene (CR) rubber was carried out successfully at room temperature by covalently binding to CR via click chemistry to realize the internal plasticization of CR rubber. The structure of the synthesized product was characterized by Fourier transform infrared spectroscopy and proton nuclear magnetic resonance, and differential scanning calorimetry and thermogravimetric analysis demonstrate a lowering of the glass transition temperature of the CR-propargyl ether cardanol as compared to CR. This confirms the plasticization effect of the cardanol whe
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48

Chang, Pengyuan, Hangbo Shi, Jianxiang Miao, et al. "Frequency-stabilized Faraday laser with 10−14 short-term instability for atomic clocks." Applied Physics Letters 120, no. 14 (2022): 141102. http://dx.doi.org/10.1063/5.0083390.

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In this Letter, stabilizing a Faraday laser frequency to the atomic transition is proposed and experimentally demonstrated, where the Faraday laser can work at single- or dual-frequency modes. High-resolution spectroscopy of a cesium atom induced by a Faraday laser is obtained. By stabilizing a Faraday laser with atomic spectroscopy, the frequency fluctuations of the Faraday laser are suppressed without the need of a high-cost Pound–Drever–Hall system. The fractional frequency Allan deviation of the residual error signal is 3 × 10[Formula: see text] at the single-frequency mode. While at the d
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49

Zhao, Yuzhen, Zhenhua Li, Qing Li, et al. "Optical Properties of New Third-Order Nonlinear Materials Modified by Click Chemistry." Molecules 27, no. 15 (2022): 5006. http://dx.doi.org/10.3390/molecules27155006.

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A high-yielding click reaction was used to synthesize a series of highly conjugated, symmetrical, as well as asymmetrical compounds with a benzene core. Cyclic voltammetry and ultraviolet/visible absorption spectroscopy were carried out, and proved that the side groups of the benzene derivatives played an important role in the energy gaps, and affected the third-order non-linear optical response. The maximum absorption wavelength of the series of benzene derivatives showed an obvious red-shift. Moreover, the addition of resilient electron-withdrawing groups significantly narrowed the energy le
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50

Zhao, Junye, Yongbiao Yang, Lulu Zhang, Yang Li, and Junmin Wang. "Improving 795 nm Single-Frequency Laser’s Frequency Stability by Means of the Bright-State Spectroscopy with Rubidium Vapor Cell." Photonics 11, no. 12 (2024): 1165. https://doi.org/10.3390/photonics11121165.

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The utilization of atomic or molecular spectroscopy for frequency locking of single-frequency laser to improve laser frequency stability plays an important role in the experimental investigation of optically pumped atomic magnetometers, atomic clocks, laser cooling and trapping of atoms, etc. We have experimentally demonstrated a technique for frequency stabilization of a single-frequency laser employing the bright state spectroscopy (BSS) with a rubidium atomic vapor cell. By utilizing the counter-propagating dual-frequency 795 nm laser beams with mutually orthogonal linear polarization and a
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