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- W2034489437 abstract "In this study, pressure-broadening parameters for several H2O transitions near 7180 cm(-1) are obtained which describe collisions with (3)He and (4)He. The sensitivity of those parameters to choice of theoretical line profile (Galatry vs. Voigt) is investigated. H2O is an important species in atmospheric chemistry and astronomy. Because of this, basic fundamental research, which explores the nature of the H2O spectrum in the presence of different gases of varying physical properties, can provide useful reference data which can be applied in the fields of atmospheric and planetary remote sensing. Measurements were made using an intensity-modulated laser photoacoustic spectrometer. Results from the present work show that Galatry line profiles, with a constrained narrowing parameter, more accurately describe experimental spectra than Voigt profiles over a wide range of experimental pressure conditions. Average pressure-broadening parameters were found to be 0.0216 cm(-1)/atm and 0.0209 cm(-1)/atm for H2O in (3)He and (4)He, respectively, and were compared to a literature model for the mass-dependence of line broadening. Specific values were obtained for each transition with nominal combined uncertainties of 2-6%." @default.
- W2034489437 created "2016-06-24" @default.
- W2034489437 creator A5024989798 @default.
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- W2034489437 date "2013-05-01" @default.
- W2034489437 modified "2023-10-05" @default.
- W2034489437 title "Pressure-broadening of water transitions near 7180cm−1 by helium isotopes" @default.
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- W2034489437 doi "https://doi.org/10.1016/j.saa.2013.01.099" @default.
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