光腔衰荡光谱(CRDS)技术.doc

中国地质大学（武汉）材化学院 课程名称：文件检索 班级：031111 姓名：刘欢 学号：20111000544 题目(4)：光腔衰荡光谱(CRDS)技术1.Comparison of water isotope-ratio determinations using two cavity ring-down instruments and classical mass spectrometry in continuous ice-core analysis作者：Olivia J. Maselli , Diedrich Fritzsche , Lawrence Layman , Joseph R. McConnell , Hanno Meyer作者单位：Desert Research Institute;Alfred-Wegener Institute for Polar and Marine Research刊名：Isotopes in Environmental and Health Studies, 2013, Vol.49 (3), pp.387-398来源数据库：Taylor & Francis期刊DOI：10.1080/10256016.2013.781598关键词：cavity ring-down ; hydrogen-2 ; ice-core ; isotope measurements ; methods and equipment ; oxygen-18 ; paleoclimatology ; water ;原始语种摘要：We present a detailed comparison between subsequent versions of commercially available wavelength-scanned cavity ring-down water isotope analysers (L2120-i and L2130-i, Picarro Inc.). The analysers are used in parallel in a continuous mode by adaption of a low-volume flash evaporation module. Application of the analysers to ice-core analysis is assessed by comparison between continuous water isotope measurements of a glacial ice-core from Severnaya Zemlya with discrete isotope-ratio mass spectrometry measurements performed on parallel samples from the same ice-core. The great advances between instrument versions, particularly in the measurement of 2H, allow the continuous technique to achieve the same high level of accuracy and precision obtained using traditional isotope spectrometry techniques in a fraction of the experiment time. However, when applied to continuous ice-core measurements, increased integration times result in a compromise of the achievable depth resolution of the ice-core records.相似文献：1 Olga Garmash.Deposition History of Polychlorinated Biphenyls to the Lomonosovfonna Glacier, Svalbard: A 209 Congener Analysis.J.Environ. Sci. Technol.,20132 Ulrich Schimschal.Mathematical model of gamma-ray spectrometry borehole logging for quantitative analysis (Open-file report / United.M.,1981 2.Toward a real-time measurement of atmospheric mercury concentrations using cavity ring-down spectroscopy作者：X. Fan , H. Moosmller , D. Obrist 刊名：Atmospheric Chemistry and Physics Discussions, 2009, Vol.9 (5), pp.22143来源数据库：DOAJ期刊原始语种摘要：A new sensor based on cavity ring-down spectroscopy (CRDS) has been developed for the measurement of gaseous elemental mercury (Hg0) mass concentration with sub-ng m3 detection limit and high temporal resolution. Cavity ring-down spectroscopy is a direct absorption technique that utilizes path lengths of up to multiple kilometers in a compact absorption cell and has a significantly higher sensitivity than conventional absorption spectroscopy. Our prototype uses a frequency-doubled, tuneable dye laser emitting pulses at 253.65 nm with a pulse repetition frequency of 50 Hz. The dye laser incorporates a unique piezo element attached to its tuning grating allowing it to tune the laser on and off the Hg0 absorption line on a pulse to pulse basis to facilitate. differential absorption measurements. Hg0 absorption measurements with this CRDS laboratory prototype are highly linearly related to Hg0 concentrations determined by a Tekran 2537B analyzer over a Hg0 concentration range of four orders of magnitude, from 0.2 ng m3 to 573 ng m3 implying excellent linearity of both instruments. The current CRDS instrument has asensitivity of 0.10 ng m3 at 10 s time resolution. This tool opens new prospects for the study of Hg0 because of its high temporal resolution and reduced limited sample volume requirements (0.5 l of sample air). Future applications may include ambient Hg0 flux measurements with eddy covariance techniques, which require measurements of Hg0 concentrations with sub-ng m3 sensitivity and sub-second time resolution. 相似文献： 1 Paul J B.Ultrasensitive absorption spectroscopy with a high-finesse optical cavity and off-axis alignment.J.Applied Optics,2008,40(27) 2 Zingg W.Insulin absorption from the peritoneal cavity.J.Life support systems : the journal of the European Society for Artificial Organs,1985,3(4) 3 Synovets A S.Effect of proteolytic enzymes and their inhibitors on absorption from the abdominal cavity.J.Fiziologicheski? zhurnal,1980,26(5) 4 Gherman Titus.Modelocked cavity-enhanced absorption spectroscopy.J.Optics Express,2002,10(19) 5 Morville Jrme.Effects of laser phase noise on the injection of a high-finesse cavity.J.Applied Optics,2002,41(33) 6 Williams Skip.Quantitative detection of singlet O2 by cavity-enhanced absorption.J.Optics Letters,2004,29(10) 7 Spuler Scott.Numerical analysis of beam propagation in pulsed cavity ring-down spectroscopy.J.Applied Optics,2002,41(15) 8 Zhao Hui.Off-axis cavity enhanced absorption spectroscopy detection techniques for the measurement of carbon dioxide.J.Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis,2012,32(1) 9 Garro Barrio J.Causes of fractures in amalgam cavity restorations and their prevention.J.Revista de actualidad estomatolgica espa?ola / Ilustre Consejo General de Colegios de Odontlogos y Estomatlogos de Espa?a,1984,44(335) 10 Douvitsas G P.New aspects in cavity preparation for amalgam restorations.J.Stomatologia,1983,40(4) 11 Thomas A E.Evaluation of principles of cavity preparation design.J.The Alabama journal of medical sciences,1983,20(4) 12 Eames W B.The effects of trichloroacetic acid on the hard and soft tissues of the oral cavity.J.Journal of the Georgia Dental Association,1973,47(2) 13 Wang T.Experimental observation of photon echoes and power-efficiency analysis in a cavity environment.J.Optics letters,2007,23(22) 14 Zippilli Stefano.Suppression of Bragg scattering by collective interference of spatially ordered atoms with a high-Q cavity mode.J.Physical Review Letters,2004,93(12) 15 Geremia J M.Inverse-problem approach to designing photonic crystals for cavity QED experiments.J.Physical Review E (Statistical, Nonlinear, and Soft Matter Physics),2003,66(6 Pt 2) 16 Arrowsmith P.Short-cavity hydrogen-halide laser.J.Applied Optics,1983,22(17) 17 Tan H H.Opinion of patients on cavity preparation by extended duty dental hygienists.J.Nederlands Tijdschrift voor Tandheelkunde,1981,88(2) 18 Shimamura Tatsuro.Crystal structure of the native chaperonin complex from Thermus thermophilus revealed unexpected asymmetry at the cis-cavity.J.Structure,2004,12(8) 19 Jewett A I.Accelerated folding in the weak hydrophobic environment of a chaperonin cavity: creation of an alternate fast folding pathway.J.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2004,101(36) 20 Ewbank M D.Frequency shift and cavity length in photorefractive resonators.J.Optics Letters,1985,10(10) 3.Real-time monitoring of breath ammonia during haemodialysis: use of ion mobility spectrometry (IMS) and cavity ring-down spectroscopy (CRDS) techniques.作者：Neri Giovanni , Lacquaniti Antonio , Rizzo Giuseppe , Donato Nicola , Latino Mariangela , Buemi Michele 作者单位：Correspondence and offprint requests to: Michele Buemi; E-mail: buemimunime.it.刊名：Nephrology, Dialysis, Transplantation, 2012, Vol.27 (7), pp.2945-52来源数据库：PubMed期刊DOI：10.1093/ndt/gfr738原始语种摘要：Background The diffusion of high-performance analytical technology has opened prospects for breath diagnosis as a non-invasive diagnostic tool. In this study, ion mobility spectrometry (IMS) and cavity ring-down spectroscopy (CRDS) techniques were used to analyse ammonia gas NH3 in real-time in breath from patients undergoing haemodialysis (HD) treatment and any correlation with blood urea nitrogen (BUN) levels and Kt/V were investigated. Methods We studied 20 patients on intermittent HD treatment. The first breath samples were taken before the start of dialysis and further breath samples were taken every hour during the treatment and after the end of the session. An evaluation was also made of 20 healthy volunteers, acting as controls healthy subjects (HS). Results Breath ammonia. concentrations were higher in CRDS-HD (914.5 301.4 versus 280 120 parts per billion (p.p.b.), P 0.0001) and IMS-HD patients (964.4 402.4 versus 280 120 p.p.b., P 0.0001) than in HS. We assessed real-time variations in the levels of NH3 and showed a continuous decrease in the levels of NH3. Expired NH3 correlated directly with BUN levels, both in the IMS-HD (P = 0.002; r = 0.84; P = 0.009; r = 0.76) and in the CRDS-HD group (P = 0.005; r = 0.80; P = 0.008; r = 0.77), respectively, both before and at the end of dialysis. A direct correlation with Kt/V was found in both groups studied (IMS-HD: P = 0.003; r = 0.82; CRDS-HD: P = 0.006; r = 0.79). Conclusions Breath monitoring of NH3 with IMS and CRDS techniques could be useful to assess the real-time clinical status of patients during HD. 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Chen , J. Winderlich , C. Gerbig , A. Hoefer , C. W. Rella , E. R. Crosson , A. D. Van Pelt , J. Steinbach , O. Kolle , V. Beck , B. C. Daube , E. W. Gottlieb , V. Y. Chow , G. W. Santoni , S. C. Wofsy 刊名：Atmospheric Measurement Techniques, 2010, Vol.3 (2), pp.375来源数据库：DOAJ期刊原始语种摘要：High-accuracy continuous measurements of greenhouse gases (CO2 and CH4) during the BARCA (Balano Atmosfrico Regional de Carbono na Amaznia) phase B campaign in Brazil in May 2009 were accomplished using a newly available analyzer based on the cavity ring-down spectroscopy (CRDS) technique. This analyzer was flown without a drying system or any in-flight calibration gases. Water vapor corrections associated with dilution and pressure-broadening effects for CO2 and CH4 were derived from laboratory experiments employing measurements of water vapor by the CRDS analyzer. Before the campaign, the stability of the analyzer was assessed by laboratory tests under simulated flight conditions. During the campaign, a comparison of CO2 measurements between the CRDS analyzer and a nondispersive infrared (NDIR) analyzer on board the same aircraft showed a mean difference of 0.220.09 ppm for all flights over the Amazon rain forest. At the end of the campaign, CO2 concentrations of the synthetic calibration gases used by the NDIR analyzer were determined by the CRDS analyzer. After correcting for the isotope and the pressure-broadening effects that resulted from changes of the composition of synthetic vs. ambient air, and applying those concentrations as calibrated values of the calibration gases to reprocess the CO2 measurements made by the NDIR, the mean difference between the CRDS and the NDIR during BARCA was reduced to 0.050.09 ppm, with the mean standard deviation of 0.230.05 ppm. 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