光腔衰荡光谱技术

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1、中国地质大学(武汉)材化学院fe IL JI11课程名称：文件检索班级:031111姓名：刘欢学号：20111000544题目：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 , Lawrenee Layman , Joseph

2、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 ; is

3、otope 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

4、 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 mea

5、surements performed on parallel samples from the same ice-core. The great advanees between instrument versions, particularly in the measurement of 5 2H, allow the continuous technique to achieve the same high level of accuracy and precision obtained using traditional isotope spectrometrytechniques i

6、n 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 Gla

7、cier, 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.,19812. Toward a real-time measurement of atmospheric mercury concentrations using cavity ri

8、ng-down spectroscopy作者：X. Failn , H. Moosmuller, 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 conce

9、ntration with sub-ng m-3detection 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 spectrosco

10、py. 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 puls

11、e 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 m-3 to 573 ng m

12、-3 implying excellent linearity of both instruments. The current CRDS instrument has asensitivity of 0.10 ng m-3 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). F

13、uture applications may include ambient Hg0 flux measurements with eddy covariance techniques, which require measurements of Hg0 concentrations with sub-ng m-3 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

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22、 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 S

23、TATES 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

24、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：

25、 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 bre

26、ath 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 wer

27、e 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) an

28、d 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 =330.84; P = 0.009; r = 0.76) and

29、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 te

30、chniques could be3useful to assess the real-time clinical status of patients during HD. By using pre-dialysis ammonia values, an approximate calculation of the Kt/V(urea) ratio can be established. 相似文献：1 Neri Giovanni. Real-time monitoring of breath ammonia during haemodialysis: use of ion mobility

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41、ence of ammonia on orotic acid and urea biosynthesis in liver. J.The Journal of Nutrition,1984,114(3)4. High-accuracy continuous airborne measurements of greenhouse gases (CO2 andCH4) using the cavity ring-down spectroscopy (CRDS) technique作者：H. Chen , J. Winderlich , C. Gerbig , A. Hoefer , C. W. R

42、ella , 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

43、) during the BARCA (Balango Atmosferico Regional de Carbono na Amazonia) 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

44、 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 simu

45、lated 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, CO2concen

46、trations 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

47、 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 0.23 0.05 ppm. The results clearly show that the CRDS is sufficiently stable to be used

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59、nts of carbon monoxide in humid air using the cavity ring-down spectroscopy (CRDS) technique作者：H. Chen , A. Karion , C. W. Rella , J. Winderlich , C. Gerbig , A. Filges , T. Newberger , C. Sweeney , P. P. Tans 作者单位： NOAA Earth System Research Laboratory, Boulder, CO 80305, USA;Cooperative Institute

60、for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA;Picarro, Inc., Santa Clara, CA, USA;Max Planck Institute for Chemistry, Mainz, Germany;Max Planck Institute for Biogeochemistry, Jena, Germany刊名： Atmospheric Measurement Techniques, 2013, Vol.6 (4), pp.1031-1040 来源数据库：

61、Copernicus 期刊DOI： 10.5194/amt-6-1031-2013原始语种摘要： Accurate measurements of carbon monoxide (CO) in humid air have been madeusing the cavity ring-down spectroscopy (CRDS) technique. The measurementsof CO mole fractions are determined from the strength of its spectralabsorption in the n ear-in frared r

62、egi on (1.57 “ m) afterremov ing in terfere nces from adjace nt carb on dioxide (CO2) and watervapor (H2O) absorption lines. Water correction functions that accountfor the dilution and pressure-broadening effects as well as absorption lineinterferences from adjacent CO2 and H2O lines have been deriv

63、edfor CO2 mole fracti ons betwee n 360 390 ppm and for reported H2Omole fracti ons betwee n 0 4%. The line interference corrections areindependent of CO mole fractions. The dependence of the. line interferencecorrection on CO2 abundance is estimated to be approximately 0.3 ppb/100 ppmCO2 for dry mol

64、e fractions of CO. Comparisons of watercorrection functions from different analyzers of the same type showsignificant differences, making it necessary to perform instrument-specificwater tests for each individual analyzer. The CRDS analyzer was flown on anaircraft in Alaska from April to November in 2011, and the accuracy of theCO measurements by the CRDS analyzer has been validated against dis