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Academic literature on the topic 'Hyperfine transitions'

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Published: 4 June 2021
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Journal articles on the topic "Hyperfine transitions"

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Tong, Xi, Yi Wang, and Hui-Yu Zhu. "Gravitational Collider Physics via Pulsar–Black Hole Binaries II: Fine and Hyperfine Structures Are Favored." Astrophysical Journal 924, no. 2 (January 1, 2022): 99. http://dx.doi.org/10.3847/1538-4357/ac36db.

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Abstract A rotating black hole can be clouded by light bosons via superradiance and thus acquire an atom-like structure. If such a gravitational atom system is accompanied by a pulsar, the pulsar can trigger transitions between energy levels of the gravitational atom, and these transitions can be detected by pulsar timing. We show that in such pulsar–black hole systems, fine and hyperfine structure transitions are more likely to be probed than the Bohr transition. Also, the calculation of these fine and hyperfine structure transitions are under better analytic control. Thus, these fine and hyperfine structure transitions are more ideal probes in the search for gravitational collider signals in pulsar–black hole systems.
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Gould, Robert J. "Radiative hyperfine transitions." Astrophysical Journal 423 (March 1994): 522. http://dx.doi.org/10.1086/173830.

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Garstang, R. H. "Radiative Hyperfine Transitions." Astrophysical Journal 447 (July 1995): 962. http://dx.doi.org/10.1086/175933.

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Brill, A. S. "Hyperfine interactions in H2N." Canadian Journal of Physics 86, no. 6 (June 1, 2008): 767–81. http://dx.doi.org/10.1139/p07-205.

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All of the hyperfine interactions associated with localized and delocalized electron spin in the four isotopes of the triatomic radical H2N are treated. With nuclear Zeeman energy included, the resulting magnetic-field-dependent nuclear spin states are used to calculate the energies and nuclear spin-state mixing of the nuclear levels and the corresponding hyperfine effects upon electron paramagnetic resonance (EPR) transition energies and nuclear state transition probabilities. In the absence of nuclear spin-state mixing there would be, for example, 10 EPR transitions in D2 15N and 15 in D2 14N, all ΔmI = 0 fully allowed. In the presence of mixing, there are 243 in D2 15N and 729 in D2 14N, with large differences in probability among transitions, many 0 or small. Because of numerous (at least partially allowed) transitions, spectra from isotopes of H2 N radicals are the superposition of signals at greatly different levels of saturation. In this report, EPR spectra from D2 15N models, with either N or 2D hyperfine interaction suppressed, are simulated as a function of microwave frequency and power × spin-lattice relaxation time product. A large range of microwave frequency (and, concomitantly, magnetic field strength) will be needed to evaluate the effect of the nuclear Zeeman energy. The experimental requirements for microwave power and low temperature (long spin-lattice relaxation rate) are quantified.PACS Nos.: 33.15.Pw, 33.35.+r, 33.25.+k
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Dall’Olio, D., W. H. T. Vlemmings, B. Lankhaar, and G. Surcis. "Polarisation properties of methanol masers." Astronomy & Astrophysics 644 (December 2020): A122. http://dx.doi.org/10.1051/0004-6361/202039149.

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Context. Astronomical masers have been effective tools in the study of magnetic fields for years. Observations of the linear and circular polarisation of different maser species allow for the determination of magnetic field properties, such as morphology and strength. In particular, methanol can be used to probe different parts of protostars, such as accretion discs and outflows, since it produces one of the strongest and the most commonly observed masers in massive star-forming regions. Aims. We investigate the polarisation properties of selected methanol maser transitions in light of newly calculated methanol Landé g-factors and in consideration of hyperfine components. We compare our results with previous observations and evaluate the effect of preferred hyperfine pumping and non-Zeeman effects. Methods. We ran simulations using the radiative transfer code, CHAMP, for different magnetic field values, hyperfine components, and pumping efficiencies. Results. We find a dependence between the linear polarisation fraction and the magnetic field strength as well as the hyperfine transitions. The circular polarisation fraction also shows a dependence on the hyperfine transitions. Preferred hyperfine pumping can explain some high levels of linear and circular polarisation and some of the peculiar features seen in the S-shape of observed V-profiles. By comparing a number of methanol maser observations taken from the literature with our simulations, we find that the observed methanol masers are not significantly affected by non-Zeeman effects related to the competition between stimulated emission rates and Zeeman rates, such as the rotation of the symmetry axis. We also consider the relevance of other non-Zeeman effects that are likely to be at work for modest saturation levels, such as the effect of magnetic field changes along the maser path and anisotropic resonant scattering. Conclusions. Our models show that for methanol maser emission, both the linear and circular polarisation percentages depend on which hyperfine transition is masing and the degree to which it is being pumped. Since non-Zeeman effects become more relevant at high values of brightness temperatures, it is important to obtain good estimates of these quantities and the maser beaming angles. Better constraints on the brightness temperature will help improve our understanding of the extent to which non-Zeeman effects contribute to the observed polarisation percentages. In order to detect separate hyperfine components, an intrinsic thermal line width that is significantly smaller than the hyperfine separation is required.
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Dagdigian, Paul J. "Collisional excitation of the formyl radical (HCO) by molecular hydrogen." Monthly Notices of the Royal Astronomical Society 498, no. 4 (September 14, 2020): 5361–66. http://dx.doi.org/10.1093/mnras/staa2803.

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ABSTRACT This paper addresses the need for accurate rate coefficients for transitions between fine- and hyperfine-structure resolved rotational transitions in the formyl (HCO) radical induced by collisions with the two nuclear spin modifications of H2, the dominant molecule in the interstellar medium (ISM). These rate coefficients, as well as radiative transition rate coefficients, are required for accurate determination of the abundance of HCO in the ISM. Time-independent close-coupling quantum scattering calculations have been used to compute rate coefficients for (de-)excitation of HCO in collisions with para- and ortho-H2. These calculations utilized a potential energy surface for the interaction of HCO with H2 recently computed by the explicitly correlated RCCSD(T)-F12a coupled-cluster method. Rate coefficients for temperatures ranging from 5 to 400 K were calculated for all transitions among the fine and hyperfine levels associated with the first 22 rotational levels of HCO, whose energies are less than or equal to 144 K.
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Wiklind, T., and F. Combes. "Limits on the Variation of Physical Constants Derived from Molecular Absorption Lines." Symposium - International Astronomical Union 183 (1999): 167. http://dx.doi.org/10.1017/s0074180900132474.

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A potential diagnostic application of molecular rotational absorption lines at high redshift is to test the invariance of physical constants. This can be done by comparing the observed redshifted frequency of a molecular absorption line with redshifted lines from other types of transitions such as the 21cm hyperfine transition or electronic resonance transitions. In order to set stringent limits, it is necessary to achieve the greatest possible frequency resolution. This makes radio lines well suited for this purpose.
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Ahrens, Volker, Frank Lewen, Shuro Takano, Gisbert Winnewisser, Štepán Urban, A. A. Negirev, and A. N. Koroliev. "Sub-Doppler Saturation Spectroscopy of HCN up to 1 THz and Detection of J = 3 —> 2 (4—> 3) Emission from TMC1." Zeitschrift für Naturforschung A 57, no. 8 (August 1, 2002): 669–81. http://dx.doi.org/10.1515/zna-2002-0806.

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Very high-resolution ( ∼ 30 kHz) and very precise (±2 kHz) saturation dip and crossover dip measurements are reported for HCN. Nine consecutive rotational transitions of the vibrational ground state were recorded, covering the rotational spectrum up to the J = 11 ← 10 transition at 975 GHz. Commencing the saturation dip measurements with the J = 3 ← 2 transition located at 265 886.4 MHz, all rotational transitions were measured up to J = 11 ← 10 (ΔF = 1), positioned at a center frequency of 974 487.2 MHz. It has become possible to resolve the hyperfine structure of every rotational transition to varying degrees. Transitions obeying the selection rules ΔJ = 1, ΔF = 0 are have been resolved, those obeying the selection rules J = 1, F = 1 are only resolved for transitions lower than the J = 6 ← 5 transition.These new experimental saturation dip data, together with the molecular beam maser emission data of the J = 1 → 0 and J = 2 → 1 transitions reported by De Lucia and Gordy, (Phys. Rev. 187, 58 (1969)), and the recent terahertz measurements performed in this laboratory up to J = 22-21 at 1.946 THz (Maiwald et al., J. Mol. Spectrosc. 202, 166 (2000)), were subjected to a least squares analysis which yielded a highly precise set of molecular constants for the ground state of HCN: B = 44 315.974 970 (156) MHz, D = 0.087 216 35 (169) MHz, H = 0.086 96 (242) Hz; eQq = -4.709 03 (162) MHz, eQqJ = 0.244 (88) Hz, CN = 10.09 (38) kHz, CNJ = -0.0143 (86) mHz. Two constants, the hydrogen spin-rotation, CH = -4.35 (5) kHz, and the spin-spin interaction between the proton and nitrogen nucleus, SNH = 0.154 (3) kHz, can not be determined from the saturation dip measurements and have been taken from Ebenstein and Muenter, J. Chem. Phys. 80, 3989 (1984). There also a value for the ground state permanent electric dipole moment (in Debye’s) is given, which we quote for completeness: 〈μ〉000 = 2.985 188 (3) D. We also report the discovery of the J = 3 → 2 and J = 4 → 3 ground state rotational transitions of HCN in the dark, cold molecular cloud TMC1 by using the KOSMA 3m-Submillimeter Telescope located in the central Swiss Alps. For the J = 3 → 2 transition the hyperfine splitting has partly been resolved. The intensities of the hyperfine components are anomalous, and they are not in thermodynamic equilibrium.
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Alhasan, Abu Mohamed. "Graph Entropy Associated with Multilevel Atomic Excitation." Proceedings 46, no. 1 (March 14, 2020): 9. http://dx.doi.org/10.3390/ecea-5-06675.

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A graph-model is presented to describe multilevel atomic structure. As an example, we take the double Λ configuration in alkali-metal atoms with hyperfine structure and nuclear spin I = 3 / 2 , as a graph with four vertices. Links are treated as coherence. We introduce the transition matrix which describes the connectivity matrix in static graph-model. In general, the transition matrix describes spatiotemporal behavior of the dynamic graph-model. Furthermore, it describes multiple connections and self-looping of vertices. The atomic excitation is made by short pulses, in order that the hyperfine structure is well resolved. Entropy associated with the proposed dynamic graph-model is used to identify transitions as well as local stabilization in the system without invoking the energy concept of the propagated pulses.
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Barducci, A., R. Giachetti, and E. Sorace. "Relativistic two fermion treatment of hyperfine transitions." Journal of Physics B: Atomic, Molecular and Optical Physics 48, no. 8 (March 31, 2015): 085002. http://dx.doi.org/10.1088/0953-4075/48/8/085002.

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Dissertations / Theses on the topic "Hyperfine transitions"

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Correge, G. "Calculation of fine and hyperfine transitions in atoms and ions." Thesis, Queen's University Belfast, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394582.

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Döringshoff, Klaus. "Optical frequency references based on hyperfine transitions in molecular iodine." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/19156.

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Diese Arbeit beschäftigt sich mit der Entwicklung und Untersuchung von optischen Absolutfrequenzreferenzen basierend auf rovibronischen Übergängen in molekularen Jod. Dabei werden Methoden der Doppler-freien Sättigungsspektroskopie angewendet, um einzelne Übergänge der Hyperfeinstruktur mit Linienbreiten unterhalb von 1 MHz im B-X System von molekularem Iod bei 532 nm, der zweiten harmonischen des Nd:YAG-Laser, aufzulösen. Elektronische Regelungstechniken ermöglichen eine präzise Stabilisierung der optischen Frequenz auf die Linienmitte der Übergänge mit einer Auflösung von Teilen in 10^5. Mit dem Ziel einer weltraumtauglichen Absolutfrequenzreferenz für zukünftige Weltraummissionen, wurden zwei Spektroskopiemodule konzipiert und in quasi-monolithischen Glaskeramik-Aufbauten, als sogenanntes elegant breadboard model und engineering model, realisiert. Diese Jodfrequenzreferenzen wurden im Detail in Bezug auf ihre Frequenzstabilität und Reproduzierbarkeit untersucht und Letzteres wurde für die angestrebte Weltraumqualifizierung ersten Umwelttests, sowohl vibrations- als auch thermischen Belastungstests, unterzogen. Für die Untersuchung der Frequenzstabilität dieser Jodreferenzen wurde ein auf einen optischen Resonator hoher Güte stabilisiertes Lasersystem für direkte Frequenzvergleiche bei 1064 nm realisiert. Die Analyse der Frequenzstabilität der Jod Referenzen zeigt eine Frequenzstabilität von 6x10^−15 bei 1 s, und weniger als 2x10^−15 bei 100 s Integrationszeit, was der bis heute besten veröffentlichten Frequenzstabilität entspricht die mit Jod Referenzen erreicht wurde. Mit der erreichten Frequenzstabilität ermöglichen diese Absolutfrequenzreferenzen präzise Lasersysteme für zukünftige Weltraummissionen wie z.B. zur Detektion von Gravitationswellen, zur Vermessung des Gravitationsfelds der Erde oder für Präzisionstest fundamentaler Theorien der Physik.
This thesis deals with the development and investigation of optical absolute frequency references based on rovibronic transitions in molecular iodine. Doppler-free saturation spectroscopy methods are employed to resolve individual transitions of the hyperfine structure with linewidths below 1 MHz in the B-X system of molecular iodine at 532 nm with the second harmonic of Nd:YAG lasers. Electronic feedback control systems are employed for laser frequency stabilization to the line center of the optical transitions with a line splitting of 10^5. With the goal of a space qualified optical absolute frequency reference for future laser-interferometric space missions, two spectroscopy setups were designed and realized in quasi-monolithic, glass-ceramic setups as so called elegant bread board model and engineering model. These iodine references were characterized in detail with respect to their frequency stability and reproducibility and the engineering model was subject to environmental tests, including vibrations and thermal cycling to verify its applicability in future space missions. For the investigation of the frequency instability of these iodine references, a frequency stabilized laser system was realized based on a temperature controlled high Finesse ULE cavity for direct frequency comparisons at 1064 nm. Analysis of the frequency stability of the iodine references revealed exceptionally low fractional frequency instability of 6x10^−15 at 1 s, averaging down to less than 2×10^−15 at 100 s integration time, constituting the best reported stability achieved with iodine references to date. With the demonstrated performance, these absolute frequency references enable precision laser systems required for future space missions that are dedicated to, e.g., the detection of gravitational waves, mapping of the Earth’s gravitational field or precision test of fundamental physics.
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Razet, Annick. "Transitions hyperfines de l'iode moléculaire au service de la métrologie des fréquences optiques." Paris 11, 1988. http://www.theses.fr/1988PA112014.

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Calculs théoriques sur les structures fines et hyperfines, lisses à partir de mesures expérimentales faites aux environs de raies émises par des lasers à argon et à hélium-neon, et estimations théoriques concernant diverses transitions hyperfines obtenues à l'aide d'un laser à colorant continument accordable
Le développement, depuis maintenant presque vingt ans, des sources lasers stabilisées, a donné un regain d'intérêt aux applications métrologiques concernant les références de fréquences ou de longueurs. Parmi tous ces lasers fonctionnant dans des intervalles spectraux différents, ceux émettant dans le visible présentent un intérêt tout particulier pour ce type d'applications. La plupart sont stabilisés sur une composante hyperfine d’une raie donnée de la molécule d’iode (dont le spectre d’absorption couvre une grande partie du spectre visible) par des techniques d’absorption saturée soit dans une cellule (placée à l’intérieur ou à l’extérieur de la cavité laser) soit en utilisant un jet moléculaire. Le choix d’une raie particulière et d’une composante hyperfine particulière dépend non seulement des caractéristiques métrologiques de cette raie (pureté, largeur, …) mais aussi des sources lasers utilisées pour ces applications. L'étude théorique de ce spectre très riche est d'une grande importance pour faire un tel choix et pour apprécier les limites fondamentales des caractéristiques métrologiques d'une raie donnée. Pour cela, des calculs informatiques concernant les structures fines et hyperfines, les largeurs de transitions hyperfines, etc… sont nécessaires. Quelques exemples pratiques sont étudiés, nous présentons des calculs théoriques lissés à partir de mesures expérimentales faites aux environs de raies émises par des lasers à argon et à hélium-néon, ainsi que des estimations théoriques concernant diverses transitions hyperfines obtenues à l'aide d'un laser à colorant continûment accordable. Ces diverses sources lumineuses ont été utilisées pour faire des mesures de rapport de longueurs d'onde ou de fréquences à partir d'un interféromètre de type Michelson à champ compensé à différence de marche fixe. Les résultats obtenus ont une incertitude relative de l'ordre de dix puissance moins dix
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Cox, Simon G. "Hyperfine and Zeeman measurements in the infrared spectrum of doubly charged molecule D'3'5 C1'2'+." Thesis, University of Newcastle Upon Tyne, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366641.

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Döringshoff, Klaus [Verfasser], Achim [Gutachter] Peters, Heinz-Wilhelm [Gutachter] Hübers, and Leo [Gutachter] Hollberg. "Optical frequency references based on hyperfine transitions in molecular iodine / Klaus Döringshoff ; Gutachter: Achim Peters, Heinz-Wilhelm Hübers, Leo Hollberg." Berlin : Humboldt-Universität zu Berlin, 2018. http://d-nb.info/1182541704/34.

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Schef, Peter. "Weak Atomic Interactions." Doctoral thesis, Stockholm : Physics Department, Stockholm University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1064.

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Boucard, Stéphane. "Calcul de haute précision d'énergies de transitions dans les atomes exotiques et les lithiumoïdes : corrections relativistes, corrections radiatives, structure hyperfine et interaction avec le cortège électronique résiduel." Phd thesis, Université Pierre et Marie Curie - Paris VI, 1998. http://tel.archives-ouvertes.fr/tel-00007148.

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Dans ce mémoire, nous présentons des calculs d'énergie de transition
dans les ions lithiumoïdes et les atomes exotiques : 1) Les nouvelles
sources rendent possible la fabrication d'ions lourds fortement
chargés. Nous nous sommes intéressés à l'étude de la structure
hyperfine des ions lithiumoïdes. Cela nous permet d'examiner les
problèmes relativistes à plusieurs corps et la partie magnétique des
corrections d'Electrodynamique Quantique (QED). Dans les ions lourds,
ces dernières sont de l'ordre de quelques pour-cents par rapport à
l'énergie totale de la transition hyperfine. Nous avons également
évalué l'effet de Bohr-Weisskopf lié à la distribution du moment
magnétique dans le noyau. Nous avons calculé puis comparé ces
différentes contributions en incluant les corrections radiatives
(polarisation du vide et self-énergie) ainsi que l'influence du
continuum négatif. 2) Un atome exotique est un atome dans lequel un
électron du cortège est remplacé par une particule de même charge :
$\mu^(-)$, $\pi^(-)$, $\bar(p)$\ldots Des expériences récentes ont
permis de gagner trois ordres de grandeur en précision et en
résolution. Nous avons voulu améliorer la précision des calculs
d'énergies de transitions nécessaires à la calibration et à
l'interprétation dans deux cas : la mesure de paramètres de
l'interaction forte dans l'hydrogène anti-protonique ($\bar(p)$H) et
la détermination de la masse du pion grâce à l'azote pionique
($\pi$N). Nos calculs prennent en compte la structure hyperfine et le
volume de la distribution de charge de la particule. Nous avons
amélioré le calcul de la polarisation du vide qui ne peut plus être
traitée au premier ordre de la théorie des perturbations dans le cas
des atomes exotiques. Pour les atomes anti-protoniques, nous avons
également ajouté la correction du g-2. Elle provient du caractère
composite de l'anti-proton qui de ce fait possède un rapport
gyromagnétique g $\approx$ -5.5856 .
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Fraval, Elliot, and elliot fraval@gmail com. "Minimising the Decoherence of Rare Earth Ion Solid State Spin Qubits." The Australian National University. Research School of Physical Sciences and Engineering, 2006. http://thesis.anu.edu.au./public/adt-ANU20061010.124211.

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[Mathematical symbols can be only approximated here. For the correct display see the Abstract in the PDF files linked below] This work has demonstrated that hyperfine decoherence times sufficiently long for QIP and quantum optics applications are achievable in rare earth ion centres. Prior to this work there were several QIP proposals using rare earth hyperfine states for long term coherent storage of optical interactions [1, 2, 3]. The very long T_1 (~weeks [4]) observed for rare-earth hyperfine transitions appears promising but hyperfine T_2s were only a few ms, comparable to rare earth optical transitions and therefore the usefulness of such proposals was doubtful. ¶ This work demonstrated an increase in hyperfine T_2 by a factor of 7 × 10^4 compared to the previously reported hyperfine T_2 for Pr^[3+]:Y_2SiO_5 through the application of static and dynamic magnetic field techniques. This increase in T_2 makes previous QIP proposals useful and provides the first solid state optically active Lamda system with very long hyperfine T_2 for quantum optics applications. ¶ The first technique employed the conventional wisdom of applying a small static magnetic field to minimise the superhyperfine interaction [5, 6, 7], as studied in chapter 4. This resulted in hyperfine transition T_2 an order of magnitude larger than the T_2 of optical transitions, ranging fro 5 to 10 ms. The increase in T_2 was not sufficient and consequently other approaches were required. ¶ Development of the critical point technique during this work was crucial to achieving further gains in T_2. The critical point technique is the application of a static magnetic field such that the Zeeman shift of the hyperfine transition of interest has no first order component, thereby nulling decohering magnetic interactions to first order. This technique also represents a global minimum for back action of the Y spin bath due to a change in the Pr spin state, allowing the assumption that the Pr ion is surrounded by a thermal bath. The critical point technique resulted in a dramatic increase of the hyperfine transition T_2 from ~10 ms to 860 ms. ¶ Satisfied that the optimal static magnetic field configuration for increasing T_2 had been achieved, dynamic magnetic field techniques, driving either the system of interest or spin bath were investigated. These techniques are broadly classed as Dynamic Decoherence Control (DDC) in the QIP community. The first DDC technique investigated was driving the Pr ion using a CPMG or Bang Bang decoupling pulse sequence. This significantly extended T_2 from 0.86 s to 70 s. This decoupling strategy has been extensively discussed for correcting phase errors in quantum computers [8, 9, 10, 11, 12, 13, 14, 15], with this work being the first application to solid state systems. ¶ Magic Angle Line Narrowing was used to investigate driving the spin bath to increase T_2. This experiment resulted in T_2 increasing from 0.84 s to 1.12 s. Both dynamic techniques introduce a periodic condition on when QIP operation can be performed without the qubits participating in the operation accumulating phase errors relative to the qubits not involved in the operation. ¶ Without using the critical point technique Dynamic Decoherence Control techniques such as the Bang Bang decoupling sequence and MALN are not useful due to the sensitivity of the Pr ion to magnetic field fluctuations. Critical point and DDC techniques are mutually beneficial since the critical point is most effective at removing high frequency perturbations while DDC techniques remove the low frequency perturbations. A further benefit of using the critical point technique is it allows changing the coupling to the spin bath without changing the spin bath dynamics. This was useful for discerning whether the limits are inherent to the DDC technique or are due to experimental limitations. ¶ Solid state systems exhibiting long T_2 are typically very specialised systems, such as 29Si dopants in an isotopically pure 28Si and therefore spin free host lattice [16]. These systems rely on on the purity of their environment to achieve long T_2. Despite possessing a long T_2, the spin system remain inherently sensitive to magnetic field fluctuations. In contrast, this work has demonstrated that decoherence times, sufficiently long to rival any solid state system [16], are achievable when the spin of interest is surrounded by a concentrated spin bath. Using the critical point technique results in a hyperfine state that is inherently insensitive to small magnetic field perturbations and therefore more robust for QIP applications.
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Gonzalez, Gabriel. "ELECTRON TRANSPORT IN SINGLE MOLECULE MAGNET TRANSISTORS AND OPTICAL LAMBDA TRANSITIONS IN THE NITROGEN-VACANCY CENTER IN DIAMON." Doctoral diss., University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2976.

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This thesis presents some theoretical studies dealing with quantum interference effects in electron transport through single molecule magnet transistors and a study on optical non-conserving spin transitions in the Nitrogen-vacancy center in diamond. The thesis starts with a brief general introduction to the physics of quantum transport through single electron transistors. Afterwards, the main body of the thesis is divided into three studies: (i) In chapter (2) we describe the properties of single molecule magnets and the Berry phase interference present in this nanomagnets. We then propose a way to detect quantum interference experimentally in the current of a single molecule magnet transistor using polarized leads. We apply our theoretical results to the newly synthesized nanomagnet Ni4. (ii) In chapter (3) we review the Kondo effect and present a microscopic derivation of the Kondo Hamiltonian suitable for full and half integer spin nanomagnets. We then calculate the conductance of the single molecule magnet transistor in the presence of the Kondo effect for Ni4 and show how the Berry phase interference becomes temperature dependent. (iii) We conclude in chapter (4) with a theoretical study of the single Nitrogen vacancy defect center in diamond. We show that it is possible to have spin non-conserving transitions via the hyperfine interaction and propose a way to write and read quantum information using circularly polarized light by means of optical Lambda transitions in this solid state system.
Ph.D.
Department of Physics
Sciences
Physics PhD
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Cornish, Simon Lee. "A solid state laser system for high resolution spectroscopy of the 1S-2S transition in muonium." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297937.

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Books on the topic "Hyperfine transitions"

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Sy, John C. The martensite phase transition in NiTi studied by perturbed [gamma]-[gamma] angular correlations. 1992.

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Book chapters on the topic "Hyperfine transitions"

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Sobelman, Igor I. "Hyperfine Structure of Spectral Lines." In Atomic Spectra and Radiative Transitions, 156–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-76907-8_6.

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Ericsson, Tore, Örjan Amcoff, and Per Nordblad. "Two magnetic transitions at lower temperature in (Fe1−xMex)2SiS4-thioolivines, Me = Mg or Mn." In Hyperfine Interactions (C), 401–4. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0281-3_99.

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Kolbinger, B., A. Capon, M. Diermaier, S. Lehner, C. Malbrunot, O. Massiczek, C. Sauerzopf, M. C. Simon, and E. Widmann. "Numerical simulations of hyperfine transitions of antihydrogen." In EXA 2014, 47–51. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-45018-6_7.

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Olin, A. "Observation of hyperfine transitions in trapped ground-state antihydrogen." In EXA 2014, 41–46. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-45018-6_6.

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Filippov, V. P., N. I. Kargin, and P. V. Alferov. "Hyperfine interaction and phase transitions in oxide films of zirconium alloys." In HFI / NQI 2012, 231–38. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-6479-8_35.

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Gütlich, Philipp, Eckhard Bill, and Alfred X. Trautwein. "Hyperfine Interactions." In Mössbauer Spectroscopy and Transition Metal Chemistry, 73–135. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-88428-6_4.

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Stanek, J., S. S. Hafner, and P. Fornal. "Metal — tellurium bonds in 3d-transition metal ditellurides." In Hyperfine Interactions (C), 355–58. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0281-3_88.

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Onodera, Hideya, Takaomi Itoi, Kentaro Indoh, Takeshi Takamizawa, Aya Tobo, and Akihisa Inoue. "Charge state of rare earth ions and glass transition in the glassy Al85Ni10R5 alloys." In Hyperfine Interactions (C), 79–82. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0281-3_20.

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Goto, T., J. Takahashi, Y. Itoh, K. Ohyama, Y. Yamaguchi, and H. Yoshida. "Mössbauer and Neutron Diffraction Studies on the Magnetic Phase Transition in Antiferromagnetic FePt0.5Ir0.5 Alloy." In Hyperfine Interactions (C), 225–28. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0281-3_56.

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Doberkat, Ernst-Erich. "Hyperfinite Approximations to Labeled Markov Transition Systems." In Algebraic Methodology and Software Technology, 127–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11784180_12.

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Conference papers on the topic "Hyperfine transitions"

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Knize, Randy J., Carson D. McLaughlin, and Mark D. Lindsay. "Laser Induced Fluorescence Spectroscopy of the Rb 5S - 6S One- and Two-Photon M1 Transition." In Latin America Optics and Photonics Conference. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/laop.2022.tu1d.6.

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We measure the Rb 5S-6S M1 transition, in a cell or atomic beam. We find the two-photon hyperfine transitions, and splittings with accuracy 10 kHz. We report progress on the one-photon highly forbidden transition measurements.
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Yi-Chi Lee, Hsiang-Chen Chui, Zong-Syun He, and Chin-Chun Tsai. "Using electromagnetically induced transparency to assign the hyperfine transitions." In 2008 Conference on Lasers and Electro-Optics (CLEO). IEEE, 2008. http://dx.doi.org/10.1109/cleo.2008.4552059.

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Schneiderman, Max, Danielle Reyes, Robert Bernath, Henry O. Everitt, and Martin Richardson. "Transient Coherence in IR/THz Double Resonance Spectroscopy for Remote Sensing." In Frontiers in Optics. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/fio.2022.ftu6e.5.

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Infrared/Terahertz double resonance spectroscopy is explored for remote identification of trace molecular gases at atmospheric pressures. Free induction decay of low pressure hyperfine-resolved transitions in CH335Cl inform a roadmap for future atmospheric pressure studies.
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Bala, Rajni, Joyee Ghosh, Vivek Venkataraman, and Quantum Photonics Lab (MS-542). "Reduced rate equation models for accurate SAS of 87Rb D2 line." In Frontiers in Optics. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/fio.2022.jw4a.78.

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We propose simplified reduced 5-level and 7-level rate equation models to calculate saturated absorption spectra of the Rb D2 line, and experimentally verify for transitions from upper and lower hyperfine ground state of 87Rb, respectively.
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Bushaw, B. A., H. J. Kluge, J. Lantzsch, R. Schwalbach, M. Schwarz, J. Stenner, H. Stevens, K. Wendt, and K. Zimmer. "Hyperfine structure of 87,89Sr 5s4d3D−5snf transitions in collinear fast beam RIMS." In The 7th international symposium: Resonance ionization spectroscopy 1994. AIP, 1995. http://dx.doi.org/10.1063/1.47585.

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Chen, Lisheng, and Jun Ye. "Systematical Measurement of Molecular Iodine Hyperfine Transitions in the Wavelength Range of 500-517 Nm." In 2004 Conference on Precision electromagnetic Digest. IEEE, 2004. http://dx.doi.org/10.1109/cpem.2004.305539.

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Harilal, Sivanandan S., Bruce E. Bernacki, and Mark C. Phillips. "Detection of isotopic shifts and hyperfine structures of uranium transitions using LIF of laser ablation plumes." In CLEO: Science and Innovations. Washington, D.C.: OSA, 2019. http://dx.doi.org/10.1364/cleo_si.2019.sw4l.3.

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Liu, Tze-Wei, Wang-Yau Cheng, and Yen-Chu Hsu. "DUAL COMB RAMAN SPECTROSCOPY ON CESIUM HYPERFINE TRANSITIONS-TOWARD A STIMULATE RAMAN SPECTRUM ON CF4 MOLECULE." In 70th International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2015. http://dx.doi.org/10.15278/isms.2015.tf12.

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Simon, M. C. "Rabi Experiments on the σ and π Hyperfine Transitions in Hydrogen and Status of ASACUSA’s Antihydrogen Program." In Eighth Meeting on CPT and Lorentz Symmetry. WORLD SCIENTIFIC, 2020. http://dx.doi.org/10.1142/9789811213984_0001.

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Ilkhchy, K. Saeedi, M. Steger, M. L. W. Thewalt, N. Abrosimov, H. Riemann, P. Becker, and H. J. Pohl. "Bi donor hyperfine state populations studied by optical transitions of donor bound excitons in enriched [sup 28]Si." In THE PHYSICS OF SEMICONDUCTORS: Proceedings of the 31st International Conference on the Physics of Semiconductors (ICPS) 2012. AIP, 2013. http://dx.doi.org/10.1063/1.4848530.

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Reports on the topic "Hyperfine transitions"

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Young, L., C. Kurtz, and S. Hasegawa. Hyperfine structure studies of transition metals. Office of Scientific and Technical Information (OSTI), August 1995. http://dx.doi.org/10.2172/166498.

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Beck, D. R. Theoretical hyperfine structure constants for transition metal atoms and ions. Office of Scientific and Technical Information (OSTI), March 1993. http://dx.doi.org/10.2172/6642937.

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Beck, D. R. Theoretical hyperfine structure constants for transition metal atoms and ions. Progress report. Office of Scientific and Technical Information (OSTI), March 1993. http://dx.doi.org/10.2172/10142648.

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