光腔衰荡光谱技术

1、中国地质大学(武汉)材化学院班级:031111姓名：刘欢学号：20111000544 题目(4)：光腔衰荡光谱(CRDS)技术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 , Ha

2、nno 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 ;

3、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 continu

4、ous 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

5、 parallel samples from the same ice-core. The great advances 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 in a fraction of the ex

6、periment 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.Olga Garmash. Deposition History of Polychlorinated Biphenyls to the Lomonosovfonna Glacier, Svalbard: A 209 Congene

7、r Analysis. J.Environ. Sci. Technol.,2013Ulrich Schimschal. Mathematical model of gamma-ray spectrometry borehole logging for quantitative analysis (Open-file report / United. M.,1981Toward a real-time measurement of atmospheric mercury concentrations using cavity ring-down spectroscopy作者：X. Fain ,

8、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 concentration with sub-ng m-3 detection li

9、mit 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-d

10、oubled, 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

11、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-3 implying excellent linearity of b

12、oth 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). Future applications may include ambie

13、nt Hg0 flux measurements with eddy covariance techniques, which require measurements of Hg0 concentrations with sub-ng m-3 sensitivity and sub-second time resolution.Paul J B. Ultrasensitive absorption spectroscopy with a high-finesse optical cavity and off-axis alignment. J.Applied Optics,2008,40(2

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23、onators. J.Optics Letters,1985,10(10)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：

24、Correspondence and offprint requests to: Michele Buemi; E-mail: HYPERLINK mailto:buemimunime.it 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 open

25、ed 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 correlatio

26、n 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

27、 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 土 301.4 versus 280 土 120 parts per billion (p.p.b.), P 0.0001) and IMS-HD patients(964.4 土 402.4 versus 280 土 120 p.p.b., P 0.0001) than

28、in HS. We assessed real-time variations in the levels of NHJ3 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), res

29、pectively, 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

30、 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：Neri Giovanni. Real-time monitoring of breath ammonia during haemodialysis: use of ion mobility spectrometry (IMS) and cavity ring-down spectroscopy (CRDS) technique

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41、borne measurements ofgreenhouse gases (CO2 andCH4) using the cavity ring-downspectroscopy (CRDS) technique作者：H. 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 ,

42、 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 (CQ and CH4) during the BARCA (Balango Atmosferico Regional de Carbono na Amazonia) phase B campaign in Brazil in May 2009 were accomplished using a

43、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 CQ and CH4 were derived from laboratory exper

44、iments 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 CQ measurements between the CRDS analyzer and a nondispersive infrared (NDIR)

45、 analyzer on board the same aircraft showed a mean difference of 0.22+0.09 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 isoto

46、pe 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 CQ measurements made by the NDIR, the mean difference between the CRDS and the NDIR duri

47、ng BARCA was reduced to 0.05+0.09 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 in flight without drying the air or calibrating in flight and the water corrections are fully adequate for high-accuracy continuous air

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58、lysis with a pulsed-flow chemiluminescence analyser. J.Analytica Chimica Acta,2002,461Accurate measurements of carbon monoxide in humidair 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

59、, P. P. Tans作者单位： NOAA Earth System Research Laboratory, Boulder, CO 80305, USA;Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA;Picarro, Inc., Santa Clara, CA, USA;Max Planck Institute for Chemistry, Main z, Germany;Max Planck Institute for Biog

60、eochemistry, Jena, Germany刊名：Atmospheric Measurement Techniques, 2013, Vol.6 (4), pp.1031-1040 来源数据库：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 C