Diode laser measurements of temperature-dependent collisional-narrowing and broadening parameters of Ar-perturbed H2O transitions at 1391.7 and 1397.8 nm

Hejie Li*, Aamir Farooq, Jay B. Jeffries, Ronald K. Hanson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

High-resolution absorption lineshapes of two H2O transitions near 7185.60 and 7154.35 cm-1 have been recorded in a heated static cell as a function of temperature (296-1100 K) and pressure (6-830 Torr) using two distributed-feedback diode lasers. The measured absorption spectra are least squares fit to both Voigt and Galatry profiles. Strong collisional-narrowing effects are observed in the Ar-broadened H2O spectra at near-atmospheric pressure due to the relatively weak collisional broadening induced by Ar-H2O collisions, while collisional narrowing is not significant for pure H2O absorption lineshapes. Line strengths and self-broadening coefficients are inferred from the pure H2O absorption spectra and compared with published data. Temperature dependences of the Ar-induced broadening, narrowing, and shift coefficients are determined using Galatry fits to the absorption data. The measured collisional-narrowing parameters have similar temperature dependence to the collisional-broadening coefficients.

Original languageEnglish (US)
Pages (from-to)132-143
Number of pages12
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Volume109
Issue number1
DOIs
StatePublished - Jan 1 2008

Keywords

  • Absorption
  • Ar
  • Collisional (Dicke) narrowing
  • Collisional broadening
  • HO
  • High temperature
  • Line strength

ASJC Scopus subject areas

  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy

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