Tesis sobre el tema "SATURATED-ABSORPTION CAVITY RING-DOWN SPECTROSCOPY"
Crea una cita precisa en los estilos APA, MLA, Chicago, Harvard y otros
Consulte los 25 mejores tesis para su investigación sobre el tema "SATURATED-ABSORPTION CAVITY RING-DOWN SPECTROSCOPY".
Junto a cada fuente en la lista de referencias hay un botón "Agregar a la bibliografía". Pulsa este botón, y generaremos automáticamente la referencia bibliográfica para la obra elegida en el estilo de cita que necesites: APA, MLA, Harvard, Vancouver, Chicago, etc.
También puede descargar el texto completo de la publicación académica en formato pdf y leer en línea su resumen siempre que esté disponible en los metadatos.
Explore tesis sobre una amplia variedad de disciplinas y organice su bibliografía correctamente.
Burkart, Johannes. "Optical feedback frequency-stabilized cavity ring-down spectroscopy - Highly coherent near-infrared laser sources and metrological applications in molecular absorption spectroscopy". Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAY045/document.
Texto completoHigh-precision molecular absorption spectroscopy is a powerful tool for fundamental physics and metrology, as well as for a broad range of applications in fields such as environmental sciences, planetology and astrophysics. In recent years, spectroscopic techniques based on the enhanced interaction of laser light with molecular samples in high-finesse optical cavities have provided outstanding detection sensitivities on the absorption axis, while the spectrometer frequency axis rarely met as high precision standards.In this thesis, we addressed this challenge by the development of Optical Feedback Frequency-Stabilized Cavity Ring-Down Spectroscopy (OFFS-CRDS). This novel technique features a unique combination of sub-kHz frequency resolution and stability, kW/cm^2-level intracavity light intensity, a shot-noise limited absorption detectivity down to 2 x 10^(−13) cm^(−1)Hz^(-1/2), as well as a detection limit of 8.4 x 10^(−14) cm^(−1) on a narrow spectral interval. This unprecedented performance is based on the tight Pound-Drever-Hall lock of the ring-down cavity to a single-sideband-tuned distributed-feedback diode laser which is optical-feedback-stabilized to a highly stable V-shaped reference cavity. To transfer the coherence of this sub-kHz laser source to noisier lasers in other spectral regions through an optical frequency comb, we have explored a novel high-bandwidth feed-forward phase cloning scheme and demonstrated a residual phase error as low as 113 mrad. Applying OFFS-CRDS to the spectroscopy of CO_2 near 1.6 μm, we obtained a broadband spectrum with a dynamic range of 8 x 10^5 and retrieved twelve absolute transition frequencies with kHz-accuracy by measuring sub-Doppler saturated absorption Lamb dips with a comb-assisted setup. Furthermore, we have performed a comprehensive analysis of systematic error sources in CRDS and derived an analytic formula for the non-exponential ring-down signal in a weakly saturated regime, which may contribute towards future concentration-independent transition dipole moment measurements. Our results open up promising perspectives for metrological applications of OFFS-CRDS, such as advanced absorption lineshape studies, isotopic ratio measurements and extensive saturated absorption spectroscopy in the near infrared
NAKAEMA, WALTER M. "Espectroscopia de cavidade ressonante tipo ring-down supercontinuum resolvida no tempo para deteccao de multicomponentes gasosos". reponame:Repositório Institucional do IPEN, 2010. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9590.
Texto completoMade available in DSpace on 2014-10-09T13:56:28Z (GMT). No. of bitstreams: 0
Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
CAVALCANTI, FABIO. "Desenvolvimento de um laser pulsado com emissão em 1053 nm para utilização na técnica de "Cavity Ring-Down Spectroscopy". reponame:Repositório Institucional do IPEN, 2014. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11790.
Texto completoMade available in DSpace on 2014-11-10T10:46:11Z (GMT). No. of bitstreams: 0
Dissertação (Mestrado em Tecnologia Nuclear)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Mercier, Xavier. "Mesure de concentrations absolues d'espèces réactives minoritaires dans les flammes par la technique d'absorption Cavity Ring Down Spectroscopy (CRDS)". Lille 1, 2000. http://www.theses.fr/2000LIL10154.
Texto completoDans ce memoire, nous montrons l'interet et les potentialites du crds pour l'etude de flammes homogenes. Pour ce faire, nous explicitons dans le detail le principe du crds et les precautions a prendre pour la mesure de concentrations absolues. Par ailleurs, une comparaison des profils de concentration absolue obtenus par crds (de cn et ch notamment) dans une flamme de ch 4/o 2 dopee en no, avec ceux issus de la modelisation au moyen du logiciel premix est egalement presentee. Le tres bon accord de cette comparaison montre que le crds, de part sa haute sensibilite et son caractere quantitatif direct, se revele etre une methode des plus efficaces pour la mesure de concentrations absolues d'especes dans des flammes homogenes
Vasilchenko, Semen. "Development of an ultrasensitive cavity ring down spectrometer in the 2.10-2.35 µm region : application to water vapor and carbon dioxide". Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAY037/document.
Texto completoA cavity ring down spectrometer has been developed in the 2.00-2.35 µm spectral range to achieve highly sensitive absorption spectroscopy of molecules of atmospheric and planetologic interest and at high spectral resolution. This spectral region corresponds to a transparency window for water vapor and carbon dioxide. Atmospheric windows, where absorption is weak, are used to sound the Earth’s and Venus’ atmospheres where water vapor and carbon dioxide represent the main gaseous absorbers in the infrared, respectively.The CRDS technique consists of injecting photons inside a high finesse optical cavity and measuring the photon’s life time of this cavity. This life-time depends on the mirror reflectivity and on the intra-cavity losses due to the absorbing gas in the cavity. Measuring these losses versus the wavelength allow obtaining the absorption spectrum of the gas. The extreme reflectivity of the mirrors allows reaching, for a 1-meter long cavity, a sensitivity equivalent to the one obtained classically with absorption cells of several thousands of kilometers.Three DFB laser diodes emitting around 2.35, 2.26, 2.21 µm were used with this spectrometer giving access to the 4249-4257, 4422-4442 and 4516-4534 cm-1 interval, respectively. Thanks to optical feedback from an external cavity, two of these diodes were spectrally narrowed leading to a better injection of the high finesse cavity thus reducing the noise level of the spectrometer. In parallel, we tested a VECSEL (Vertical-external-Cavity, Surface Emitting laser) through a collaboration with the Institu d’Electronique (IES, UMR 5214) in Montpellier and the Innoptics firm. This laser source is able to cover a 80 cm-1 spectral range centered at 4340 cm-1, equivalent to four DFB laser diodes. In routine the achieved sensitivity with this spectrometer, corresponding to the minimum detectable coefficient is typically of 1×10-10 cm-1. The introductive chapter (Chapter 1) makes the point on the different techniques allowing absorption spectra recordings in the studied spectral region and on their sensitivity. The experimental set-up, the characteristics and performances by the CRD spectrometer developed in this work are detailed in Chapter 2. To our knowledge this instrument is the most sensitive in the considered spectral region.In Chapter 3, detection of quadrupolar electric transitions of HD and N2 illustrate the level of sensitivity reached: (i) the S(3) transition in the 1-0 band of HD has been recorded for the first time and its intensity measured (S=2.5×10-27 cm/molecule), (ii) the position and intensity of the highly forbidden O(14) quadrupolar electric transition of the 2-0 band of N2 have also been newly determined.The two last chapters are devoted to the characterization of the CO2 absorption, in the centre of the transparency window, and of the water vapor absorption. In both cases, we not only studied the allowed transitions of the monomer, but also the continuum absorption. This latter correspond to a weak background absorption varying slowly with the wave length. The self-continuum cross-sections of the water vapor continuum were measured in many spectral points through the transparency window with a much better accuracy compared to existing measurements. These CRDS data constitute a valuable data set to validate the reference model (MT_CKD) for the continuum which is implemented in most of the atmospheric radiative transfer codes
Kiwanuka, Ssegawa-Ssekintu. "Supercontinuum radiation for ultra-high sensitivity liquid-phase sensing". Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/245137.
Texto completoChase, Tanya. "Greenhouse gas detection using cavity enhanced absorption spectroscopy and cavity ring-down spectroscopy : trace detection of CH₄, CO₂ and N₂0 in ambient air, standard gas samples and in the headspace of soils". Thesis, University of Bristol, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.686246.
Texto completoLu, Jessica Weidgin. "Dynamics of Atmospherically Important Triatomics in Collisions with Model Organic Surfaces". Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/77045.
Texto completoPh. D.
Li, Jing. "Applications of optical-cavity-based spectroscopic techniques in the condensed phase". Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:d6a0c476-e67f-4390-a63a-e3cb9e60bf2c.
Texto completoDavies, Nicholas William. "The climate impacts of atmospheric aerosols using in-situ measurements, satellite retrievals and global climate model simulations". Thesis, University of Exeter, 2018. http://hdl.handle.net/10871/34544.
Texto completoGolebiowski, Dariusz. "High resolution FTIR spectroscopy using a femto-OPO laser source and cavity enhanced absorption". Doctoral thesis, Universite Libre de Bruxelles, 2015. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/221150.
Texto completoDoctorat en Sciences
info:eu-repo/semantics/nonPublished
Pei-Ying, Wei. "Photodissociation of bromine containing molecules by using cavity ring-down absorption spectroscopy". 2006. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2806200614432900.
Texto completoWei, Pei-Ying y 魏佩瑩. "Photodissociation of bromine containing molecules by using cavity ring-down absorption spectroscopy". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/83819536772905349134.
Texto completo國立臺灣大學
化學研究所
94
Cavity Ring-down Spectroscopy (CRDS) is a relatively new direct absorption technique and its applications are developed very quickly in recently years. The method is based on measurement of the decay rate of a pulse light trapped in an optical cavity which is formed by a pair of highly reflective(R>99.9%) mirrors. A plot of decay rate as a function of laser frequency gives the absorption spectrum. We used a pump-probe technique to study of nascent vibrational distribution and the quantum yield of Br2 following photodissociation of CH2Br2 and CHBr2Cl and then we can deduce two possible photodissociation mechanisms for CH2Br2 and CHBr2Cl to product Br2. Moreover, the results agree with a given theoretical calculation.
Lee, Hsin-Lung y 李欣隆. "Photodissociation of 1,1- and 1,2-dibromoethane by using cavity ring-down absorption spectroscopy". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/53112064645872719133.
Texto completoSanti, Delli. "ULTRA-SENSITIVE SPECTROSCOPIC MEASUREMENT OF RADIOCARBON DIOXIDE IN SAMPLES FOR RELEVANT APPLICATIONS". Doctoral thesis, 2021. http://hdl.handle.net/2158/1236015.
Texto completoBescherer-Nachtmann, Klaus. "Fibre-Loop Ring-Down Spectroscopy Using Liquid Core Waveguides". Thesis, 2013. http://hdl.handle.net/1974/7906.
Texto completoThesis (Ph.D, Chemistry) -- Queen's University, 2013-04-23 14:08:16.33
Chen, Ming-Shiang y 陳明祥. "Using cavity-ring down absorption spectroscopy to observe Rhodamine B adsorbed on silica/liquid interface". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/34064398171551057174.
Texto completoChing-Yi, Hsu. "Vibrational distribution of Br2 molecule following photodissociation of CF2Br2 by using cavity ring down absorption spectroscopy". 2005. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2806200517430200.
Texto completoHsu, Ching-Yi y 許靜怡. "Vibrational distribution of Br2 molecule following photodissociation of CF2Br2 by using cavity ring down absorption spectroscopy". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/58807109571972625439.
Texto completo國立臺灣大學
化學研究所
93
Cavity ring-down Spectroscopy (CRDS) is a relatively new direct absorption technique and its applications are developed very quickly in recently years. The method is based on measurement of the decay rate of a pulse light trapped in an optical cavity which is formed by a pair of highly reflective(R>99.9%) mirrors. A plot of decay rate as a function of laser frequency gives the absorption spectrum. As for photodissociation studies of CF2Br2, the major dissociation channels are found to be CF2Br2 → CF2Br + Br ΔH=274 kJ/mol CF2Br2 → CF2 + Br2 ΔH=231 kJ/mol We used a cavity ring-down spectroscopy (CRDS) to study of nascent Br2 following photodissociation of CF2Br2. The quantum yield of Br2 is found to be 0.038±0.009 following photodissociation of CF2Br2 at 248nm. According to the absorption spectrum, the nascent vibrational distribution was obtained. A comparison with the CHBr3 case reveals that nascent vibrational distribution leads to vibrationally cool. The excited parent molecules (CF2Br2) may transfer into highly vibrational levels of their electronic ground state via internal conversion. The results agree with a given theoretical calculation.
Yao, Yi-Ju y 姚奕如. "Study of DNA Interaction by Evanescent Wave Cavity Ring-Down Absorption Spectroscopy via Functionalized Gold Nanoparticles". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/86581380973834419624.
Texto completo國立臺灣大學
化學研究所
101
Evanescent wave cavity ring-down absorption spectroscopy (EW-CRDS) is employed to study the interaction between deoxyribonucleic acids (DNA) by functionalized gold nanoparticles (Au NPs). EW-CRDS is a surface sensitive technique based on the measurement of the decay rate of a pulsed laser light trapped in an optical cavity. The light undergoes total internal reflection (TIR) at an interface of a prism within the cavity and creates an evanescent field at the surface that is sensitive to small absorption changes and is particularly useful for investigating interfacial processes. EW-CRDS offers a significantly higher sensitivity than conventional absorption spectroscopy with a rather simple and straightforward experimental set-up. The high sensitivity results mainly from its independence of fluctuations of the light source and the extremely long effective path length realized in optical cavities. By applying this ultra-sensitive EW-CRDS to the observation of DNA, we were able to study the binding kinetics of DNA and obtain the association equilibrium constants (Ka) and the free energies (ΔG). Binding conditions such as changes in the salt concentration, buffer pH and temperature are systematically examined. This basic study gives further insight in the design of DNA detection for DNA mutation diseases.
Lin, Chen-Yang y 林震洋. "Infrared absorption spectra of CH3OO in the C-H stretch vibrational modes region detected with cavity ring-down spectroscopy". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/97622469659298283952.
Texto completo國立交通大學
應用化學系碩博士班
100
We employed a cavity ringdown spectrometer with a tunable infrared OPO/OPA laser with a bandwidth of 0.02 cm-1 to record the absorption spectra of methylperoxy radicals (CH3OO) in the range 2930-3050 cm-1. Methylperoxy radicals were produced by irradiating a flowing mixture of CH3I and O2 with emission at 248 nm from a KrF excimer laser or a flowing mixture of CH3C(O)CH3 and O2 with emission at 193 nm from an ArF excimer laser. Two absorption bands with origins at 2953.4 cm-1 and 3020.7 cm-1 were observed; they are assigned to ν2 (symmetric CH3 stretching) and ν9 (antisymmetric CH2 stretching) modes of CH3OO, respectively. We analyzed the rotational structures of the ν2 and ν9 bands by simply treating CH3OO as a prolate symmetric top, and determined the rotational constants both in the ground state and in the vibrationally excited state. We predicted vibrational wavenumbers and rotational parameters for the upper and lower vibrational states, and the mixing ratio among a-, b-, c-types of bands of CH3OO with the B3LYP/aug-cc-pVTZ density-functional theory. The rotational contours for the ν1, ν2 and ν9 bands of CH3OO were simulated with the SpecView software. For the ν2 band, the simulation agrees satisfactorily with the experimental observations except for the intense peaks with regular spacing about 2.4 cm-1 in the range 2940-2950 cm-1. For the ν9 band, the simulation result is consistent with the experimental observations in the region 3000-3020 cm-1 but not in the region 3020-3050 cm-1. The discrepancy might be due to the interference from the ν1 band. That ν1 band is unobserved is likely due to its relatively small intensity. We temporarily assigned the ν1 band to be at 3031.7 cm-1 by matching the simulated spectra with the peaks which do not correspond to the ν9 band.
Lin, Meng-Chen y 林孟蓁. "Study of Interaction between Crystal Violet and Sodium Dodecyl Sulfate on Silica/liquid Interface Using Evanescent-wave Cavity-ring Down Absorption Spectroscopy". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/06122943974013459887.
Texto completo國立臺灣大學
化學研究所
99
Abstract SDS (Sodium dodecyl sulfate, SDS) is an anionic surfactant that commonly used in many cleaners and hygiene products. At low surfactant concentration in aqueous solution, surfactant molecules exist the form of monomers. At surfactant concentrations above the critical micelle concentration(CMC), surfactant molecules in solution will spontaneously come together to form micelles (micelle), the formation of the micelle is usually detected by the changes in the physical properties of the solution, such as surface tension, conductivity or turbidity. Evanescent wave cavity ring-down spectroscopy (EW-CRDS) is based on the measurement of the decay rate of the light which goes back and forth (ring-down) in an optical cavity formed by two mirrors with extremely high reflectivity. There are two types of silanol groups at the silica/water interface with different pKa values, 4.9 and 8.5. With pKa = 4.9, the proton of the silanol group can easily dissociate, thus causing the interface to be negative. In our experiment, we choose crystal violet as molecular probes to determine surface critical micelle concentration (SCMC) of SDS. Similar, by the addition of NaCl electrolytes and changing the length of the chain of a hydrocarbon surfactant, we can obtain different surface CMC from the pure water.
Huang, Hong-Yi. "Topic I:Rotational and vibrational energy transfer effect of CH B2Sigma-(v'=1) Topic II:Vibrational distribution of Br2 molecule following photo-dissociation of bromine containing molecules by using cavity ring down absorption spectroscopy". 2004. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-1307200420511500.
Texto completoHuang, Hong-Yi y 黃鴻一. "Topic I:Rotational and vibrational energy transfer effect of CH B2Σ-(v’=1)Topic II:Vibrational distribution of Br2 molecule following photo-dissociation of bromine containing molecules by using cavity ring down absorption spectroscopy". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/52174443145415196502.
Texto completo國立臺灣大學
化學研究所
92
Part I In this thesis, it will be separated into two individual parts: part I and part II. Each part has two chapters. In the chapter 1 of part I, some basic background of spectroscopy and Fourier transform infrared method is illustrated. And in the chapter 2 of part I, the fine state-resolved rotational and vibrational energy transfer of CH B2Σ- (v’=1, N) by collisions with Ar, CO, and N2O is illustrated. It is the first time to observe the rotational energy transfer and vibrational energy transfer processes of a specific fine state for B 2Σ- (v’=1) of CH radical. We use pump-probe technique to determine RET and VET rate constants of CH B (v’ = 1, 0≦ N ≦ 6) with collisions of Ar, CO, and N2O. The RET is anticipated to be larger than VET for each collider. The determined RET rate constants range from 10-11 to 10-10 cm3 molecule-1 s-1, while the determined VET rate constants range from 10-12 to 10-11 cm3 molecule-1 s-1. The relative values of RET and VET rate constants are consistent with the results founded by Cooper and Whitehead. The findings of multi-quantum changing within single collision suggest that the collisions possibly dominated by the long-range attractive force. The k’VET shows no rotational quantum number dependence for these three quenching gases. This conclusion is the same as the results reported previously by Crosley et al. and Whitehead et al. The kVET of N2O is three times larger than that of CO and nine times larger than that of Ar, respectively. This result is related to polyatomic effect, permanent dipole moment, and inefficient vibration-translation transfer. The number of internal degrees of freedom of N2O is larger than that of CO and Ar, therefore N2O can remove more energy than CO and Ar within single collision. In other words, N2O is more efficient than CO and Ar. Polyatomic effect and permanent dipole moment play a role in vibration and rotational energy transfer process. Part II In the chapter 1 of part II, the basic working principle of cavity ring-down absorption spectroscopy (CRDAS) is introduced. In the first section in the chapter 2 of part II, the total continuous absorption which includes A – X, B – X, and C – X transition of pure diatomic bromine is obtained by using CRDAS. In the second section, the primary photodissociation channels of CHBr3 and CH2Br2 which is ignored in the past studies have been investigated. CHBr3 + hν -->�� CHBr + Br2 CH2Br2 + hν -->�� CH2 + Br2 The quantum yields of Br2 are found to be 0.23±0.05 and 0.26±0.07 following photodissociation of CHBr3 and CH2Br2 at 248nm, respectively. According to the absorption spectrum, the nascent vibrational distribution can be obtained. The bromine molecules resulted from photodissociation of CHBr3 or CH2Br2 at 248 nm are both lying at a vibrationally hot distribution. The excited parent molecules (CHBr3 and CH2Br2) may couple into highly vibrational levels of their electronic ground state via internal conversion, which could lead to vibrationally hot Br2 photofragment.
後藤, 俊夫, 勝. 堀 y 典彦 西澤. "波長可変フェムト秒ファイバレーザーを用いたプラズマ励起表面反応の動的計測法の構築". 2005. http://hdl.handle.net/2237/13134.
Texto completo