sample="quota" bates="2063593226" isource="pm" decade="1990" class="ui" date="19981000" WinSPIRS 2.1 Usage is subject to the terms and conditions of the subscription and License Agreement and the applicable Copyright and intellectual property protection as dictated by the appropriate laws of your country and/or International Convention. No. Records Request 1 5630 laser 2 366 photoacoustic 3 132 laser and photoacoustic 4 32744 gas * 5 26 #3 and gas Record 1 of 26 - Analytical Abstracts TI: Laser photoacoustic trace gas detection, an extremely sensitive technique applied in biological research. AU: te-Lintel-Hekkert, -S; Staal, -MJ; Nabben, -RHM: Zuckermann, -H; Persijn, -S; Stal, -LJ; Voesenek, -LACJ; Harren, -FJM; Reuss, -J; Parker, -DH AD: Univ. Nijmegen, Dept. Mol. and Laser Phys., 6525 ED Nijmegen, Netherlands CP: Netherlands SO: Instrum-Sci-Technol. Apr-Jun 1998; 26(2-3) : 157-175 JN: Instrumentation-Science-and-Technology IS: 1073-9149 CO: ISCTEF PY: 1998 LA: English PT: Journal AB: Gas detection using IR laser based photoacoustic detection systems in biological systems is discussed with the use of two examples, namely, a CO2 laser based photoacoustic trace gas detection system to follow time-dependent patterns in N2 fixation of cyanobacteria Nodularia spumigena and a CO laser based system to monitor acetaldehyde emission from Docks Rumex palustris post-anoxia. The laser system and measuring protocol are described in detail. IA: gases-A: detection of, in biological materials, by optoacoustic spectometry IM: biological-materials-M: detection of gases in, by optoacoustic spectrometry SC: F-Clinical-and-Biochemical-Analysis SS: 10000 COP: Copyright: The Royal Society of Chemistry AN: 6008F00026 UD: 6008 Record 2 of 26 - Analytical Abstracts TI: On the possibility of combining external cavity diode laser with photacoustic detector for high sensitivity gas monitoring. AU: Sneider,-J; Bozoki, -Z; Miklos,-A; Bor, -Z; Szabo, -G AD: Res. Group Laser Phys. Hungarian Acad. Sci., 6724 Szeged, Hungary CP: Hungary SO: Int-J-Environ-Anal-Chem. 1997; 67(1-4) : 253-260 JN: International-Journal-of-Environmental-Analytical-Chemistry IS: 0306-7319 CO: IJEAA3 PY: 1997 LA: English PT: Journal AB: The laser system (schematic given) was fabricated in the Littman (grazing incidence) configuration. The output beam had a typical power of 20-30mW and a spot size of 2 x 4 mm. The gaseous sample is held in a closed photoacoustic cell and changes in pressure in the cell were measured with a microphone. The system was tested with a mixture of high-purity synthetic air pre-mixed with 1% water vapour. Several of the absorption lines of the water were identified. The minimum detectable absorption coefficient was 3.5 x 10-8/cm. Measurements were also performed on pure acetylene and methane gases and the absorption lines here had a typical absorption coefficient of 10-5/cm in the 830-860 nm range. The cheapness, simplicity and stability of the combined system make it a promising candidate for high-sensitivity gas detection. IA: gases-A: detmn. of, by photoacoustic spectrometry, external cavity diode lasers for IM: air-M: detmn. of gases in, by photoacoustic spectrometry, external cavity diode lasers for SC: D-Inorganic-and-Organic-Analysis SS: 00000 CR: H1 COP: Copyright: The Royal Society of Chemistry AN: 6008D00005 UD: 6008 Record 3 of 26 - Analytical Abstracts TI: Development of a photoacoustic gas sensor for in situ and online measurement of gaseous water and toluene. AU: Beene, -A; Niessner, -R AD: Tech. Univ. Munich, Inst. Hydrochem., 81377 Munich, Germany L6: ANSWER 1 OF 2 HCA COPYRIGHT 1998 ACS AN 119:33277 HCA TI Atmospheric trace gas monitoring by carbon dioxide laser photoacoustic spectroscopy AU Sigrist, Markus W.; Thoeny, Andreas CS Inst. Quant. Electron., ETH Zurich, Zurich, CH-8093, Switz. SO Proc. SPIE-Int. Soc. Opt. Eng. (1993), 1715 (Optical Methods in Atmospheric Chemistry), 174-84 CODEN: PSISDG; ISSN: 0277-786X DT Journal; General Review LA English CC 59-0 (Air Pollution and Industrial Hygiene) Section cross-reference(s) : 47, 79 AB A review with 23 refs. on the main theor. and expt. characteristics of gas phase laser photoacoustic spectroscopy for monitoring air pollution. Topics of discussion include: principles of gas-phase photoacoustics, exptl. arrangement for gas phase photoacoustics, and CO2 laser photoacoustic spectroscopy. A mobile CO2 laser photoacoustic system is detailed, with examples to demonstrate the potential of this technique. ST review laser photoacoustic spectroscopy air monitoring; air pollution monitoring laser spectroscopy review IT Air pollution (monitoring, by gas phase laser photoacoustic spectroscopy) L6 ANSWER 2 OF 2 HCA COPYRIGHT 1998 ACS AN 113: 120061 HCA TI Atmospheric pollution monitoring using carbon dioxide-laser photoacoustic spectroscopy and other techniques AU Meyer, P. L.; Sigrist, M. W. CS Infrared Phys. Lab., Swiss Fed. Inst. Technol., Zurich, CH-8093, Switz. SO Rev. Sci. Instrum. (1990), 61(7), 1779-807 CODEN: RSINAK; ISSN: 0034-6748 DT Journal; General Review LA English CC 59-0 (Air Pollution and Industrial Hygiene) Section cross-reference(s): 79, 80 AB A review, with 182 refs., on methods for the detn. of air pollutants, including nonspectroscopic techniques such as gas chromatog. with flame ionization, photoionization, and electron capture detection, mass spectrometry, thermal cond., chemiluminescence, flame photometry, electrolytic cond., coulometry, and colorimetry; and various spectroscopic techniques, with the emphasis on CO2-laser photoacoustic spectroscopy. AB A novel photoacoustic (PA) system that uses a continuously tunable high-pressure CO2 laser as radiation source is presented. A min. detectable absorption coeff. of 10-6 cm-1 that is limited mainly by the desorption of absorbing species from the cell walls and by residual electromagnetic perturbation of the microphone electronics has currently been achieved. Although a linear dependence of the PA signal on the gas concn. has been obsd. over 4 orders of magnitude, the dependence on energy exhibits a non-linear behavior owing to satn. effects in excellent agreement with a theor. model. The calibration of the laser wavelength is performed by PA measurements on low-pressure CO2 gas, resulting in an abs. accuracy of .+- .10-2 cm-1. PA spectra are presented for carbon dioxide, ammonia, ozone, ethylene, methanol, ethanol, and toluene in large parts of the laser emission range. The expected improvement in detection selectivity compared with that of studies with line-tunable CO2 lasers is demonstrated with the aid of multicomponent trace-gas mixts. prepd. with a gas-mixing unit. Good agreement is obtained between the known concns. and the concns. calcd. on the basis of a fit with calibration spectra. The perspectives of the system concerning air analyses are discussed. ST photoacoustic spectroscopy air analysis; carbon dioxide laser air analysis IT Air analysis (photoacoustic spectroscopy on trace gases with continuously tunable CO2 laser) IT 64-17-5, Ethanol, analysis 67-56-1, Methanol, analysis 74-85-1, Ethylene, analysis 108-88-3, Toluene, analysis 124-38-9, Carbon dioxide, analysis 7664-41-7, Ammonia, analysis 10028-15-6, Ozone, analysis RL: ANT (Analyte); ANST (Analytical study) (photoacoustic spectroscopy on trace gases with continuously tunable CO2 laser) L7 ANSWER 9 OF 26 HCA COPYRIGHT 1998 ACS AN 123:131617 HCA TI Photoacoustic spectroscopy on gases with high pressure continuously tunable CO2 laser AU Repond, P.; Sigrist, M. W. CS ETH Zurich, Institute Quantum Electronics, Zurich, 8093, Switz. SO J. Phys. IV (1994), 4(C7 8th International Topical Meeting on Photoacoustic and Photothermal Phenomena, 1994), 523-6 CODEN: JPICEI; ISSN: 1155-4339 DT Journal LA English CC 80-2 (Organic Analytical Chemistry) Section cross-reference(s): 73 AB We present a novel photoacoustic detection system with a high pressure CO2 laser as radiation source. The laser is continuously tunable across wavelength ranges from 13 cm-1 to 18 cm-1. The narrow bandwidth of 0.017 cm-1 allows to resolve any fine structure in the absorption spectra of trace gases at atm. pressure. The absorption spectra of four gases are reported, demonstrating the great potential improvement in detection selectivity. ST carbon dioxide laser photoacoustic spectroscopy; photoacoustic spectroscopy gas continuous tunable laser IT Gas analysis (photoacoustic spectroscopy on gases with high pressure continuously tunable CO2 laser) IT Sensors (gas, photoacoustic; photoacoustic spectroscopy on gases with high pressure continuously tunable CO2 laser) IT 74-85-1, Ethylene, analysis RL: ANT (Analyte); ANST (Analytical study) (photoacoustic spectroscopy on gases with high pressure continuously tunable CO2 laser) IT 124-38-9, Carbon dioxide, uses RL: DEV (Device component use); USES (Uses) (photoacoustic spectroscopy on gases with high pressure continuously tunable CO2 laser) L7 ANSWER 10 OF 26 HCA COPYRIGHT 1998 ACS AN 122:320992 HCA TI Trace gas monitoring by laser-photoacoustic spectroscopy AU Sigrist, M. W. CS Institute Quantum Electronics, ETH, Zurich, CH-8093, Switz. SO Infrared Phys. Technol. (1995), 36(1), 415-25 CODEN: IPTEEY; ISSN: 1350-4495 DT Journal LA English CC 59-1 (Air Pollution and Industrial Hygiene) Section cross-reference(s): 51, 79, 80 AB Photoacoustic spectroscopy (PAS) with tunable IR lasers represents a promising tool for trace gas monitoring. The principles of PAS applied to multicomponent gas mixts. are outlined. We present 3 photoacoustic (PA) systems and discuss typical results. A CO laser PA system was applied to the selective anal. of volatile org. compds. (VOCs) in motor vehicle exhausts and to the study of the dimerization of fatty acid vapors. As a 2nd instrument, an automated mobile CO2 laser PA system, was used for in situ air monitoring in industrial, urban and rural environments. A detection limit in the ppb-range can be achieved depending on mol. absorption cross sections and absorption interferences. Despite some cases which demonstrate the feasibility to differentiate even between isomers, the detection selectivity could often be substantially improved using a continously rather than a line-tunable laser source. This is demonstrated by high-pressure CO2 laser which offers continuous tunability in the common CO2 laser emission branches with a linewidth of only 0.017 cm-1. AB The potential of CO2 laser photoacoustic spectroscopy and the traditional Indophenol Blue colorimetric method for detecting gaseous NH3 were compared. The results obtained with the 2 independent techniques are comparable in the range of concns. studied. ST ammonia detn air photoacoustic spectroscopy IT Air analysis (ammonia detn. in, by carbon dioxide laser photoacoustic spectrometry, comparison with colorimetry in relation to) IT 7664-41-7, Ammonia, analysis RL: ANT (Analyte); POL (Pollutant); ANST (Analytical study); OCCU (Occurrence) (detn. of, in air, by carbon dioxide laser photoacoustic spectrometry, comparison with colorimetry in relation to) L7 ANSWER 16 OF 26 HCA COPYRIGHT 1998 ACS AN 116:161441 HCA TI Photoacoustic spectroscopy of ozone with a 450-MHz tunable waveguide carbon dioxide laser AU Sokabe, Noboru; Hammerich, Mads; Pedersen, Thorvald; Olafsson, Ari; Henningen, Jes CS Phys. Lab., H. C. Oersted Inst., Copenhagen, DK-2100, Den. SO J. Mol. Spectrosc. (1992), 152(2), 420-33 CODEN: JMOSA3; ISSN: 0022-2852 DT Journal LA English CC 73-3 (Optical, Electron, and Mass Spectroscopy and Other Related Properties) Section cross-reference(s): 59 AB Photoacoustic absorption signatures have been obtained for ozone in 450-MHz tuning windows of a waveguide CO2 laser. Out of 42 obsd. absorption lines, 31 are assigned to the.nu.1 and the.nu.3 bands, and 7 to various hot bands of 160160160. Two lines are assigned to the .nu.3 band of the isotopomers 160160180 and 160180160, which were present in their natural abundance. Precise collision broadening measurements are reported for two lines of the 160160160 .nu.3 band. ST IR spectra ozone IT Spectrochemical analysis (IR spectra, of atm., photoacoustic absorption signatures of ozone in relation to) IT Infrared spectra (of ozone) IT Atmosphere (ozone IR photoacoustic absorption signatures in) IT 10028-15-6, Ozone, properties 26057-96-5, Ozone-1-180 RL: PRP (Properties) (IR spectra of, photoacoustic absorption signatures in relation to) L7 ANSWER 18 OF 26 HCA COPYRIGHT 1998 ACS AN 107:182475 HCA TI Laser-photoacoustic spectroscopy of air pollutants AU Bernegger, S.; Meyer, P. L.; Sigrist, M. W. CS Dep. Phys., Eidg. Tech. Hochsch., Zurich, Switz. SO Report (1985), M-19, ETN-86-98571; Order No. N87-14787/2/GAR, 21 pp. Avail.: NTIS From: Gov. Rep. Announce. Index (U. S.) 1987, 87(8), Abstr. No. 714,205 DT Report LA English CC 59-1 (Air Pollution and Industrial Hygiene) Section cross-reference(s): 79 AB A stationary step-tunable CO laser and a step-tunable CO2 laser installed in a trailer were used for photoacoustic spectroscopy (PAS) of pollutants. The photoacoustic chamber in both setups is a resonant cell which permits measurements in the flow mode. The high sensitivity which corresponds to a background-limited absorption coeff. of 0.00000001/cm and the wide dynamic range of PAS are discussed. Good agreement between calcd. and measured spectra for the CO laser wavelength range is obtained for various pollutants. Problems which arise due to the simultaneous oscillation of adjacent CO laser transitions and due to the interfering water vapor adsorption are outlined. Spectoral anal. of an HNO3/water vapor mixt. and its decompn. products is discussed. Excellent agreement between PAS spectra of certified gas mixts. and literature data for the CO2 laser transitions is obtained. An anal. of indoor air samples from the lab. and from a garage is presented. ST laser photoacoustic spectroscopy air analysis IT Air analysis (pollutant detn. in, by laser-photoacoustic spectroscopy) IT 124-38-9, Carbon dioxide, analysis 630-08-0, Carbon monoxide, analysis 7697-37-2, Nitric acid, analysis RL: ANT (Analyte); POL (Pollutant); ANST (Analytical study); OCCU (Occurrence) (detn. of, in air, by laser-photoacoustic spectroscopy) L7 ANSWER 20 OF 26 HCA COPYRIGHT 1998 ACS AN 106:22501 HCA TI Carbon dioxide-laser photoacoustic spectroscopy applied to low-level toxic-vapor monitoring AU Loper, G. L.; Gelbwachs, J. A.; Beck, S. M. CS Chem. Phys. Lab., Aerospace Corp., Los Angeles, CA, 90009, USA SO Can. J. Phys. (1986), 64(9), 1124-31 CODEN: CJPHAD; ISSN: 0008-4204 DT Journal LA English CC 59-1 (Air Pollution and Industrial Hygiene) Section cross-reference(s): 80 AB A CO2-laser photoacoustic detector that can detect the hazardous hydrazine-based rocket fuels and selected toxic industrial compds. at concns. of <100 ppb in ambient air is based on the principles of photoacoustic spectroscopy and classical acoustics. The low-ppb-level detection capability of the method with respect to the hydrazines is demonstrated with both acoustically nonresonant and resonant photoacoustic cell designs. A flowing resonant photoacoustic cell, whose interior is coated with Teflon, is preferable for detecting highly adsorptive or reactive compds. Photoacoustic spectroscopy is useful in measuring adsorption or reaction losses of low-concn. gases on surfaces. ST laser photoacoustic spectroscopy air analysis; vapor detn laser photoacoustic spectroscopy IT Air analysis (vapor detn. in, carbon dioxide laser photoacoustic detector for) IT 75-35-4, Vinylidenechloride, analysis 79-01-6, Trichloroethylene, analysis 302-01-2, Hydrazine, analysstudy); OCCU (Occurrence) (detn. of, in air, carbon dioxide laser photoacoustic detector in)