Eur. Phys. J. D 22, 209-215 (2003)
https://doi.org/10.1140/epjd/e2002-00240-x

Collisional broadening and shifting of ammonia absorption lines at 790 nm

Istituto per i Processi Chimico-Fisici del Consiglio Nazionale delle Ricerche, Area della Ricerca di Pisa, Via G. Moruzzi 1, 56124 Pisa, Italy

Corresponding author: ^a alex@ifam.pi.cnr.it

Received: 13 February 2002
Revised: 18 September 2002
Published online: 17 December 2002

Abstract

By using a diode laser spectrometer based on a commercial heterostructure diode laser operating in free-running mode, line shape parameters of some ammonia ro-vibrational overtones at 790 nm have been measured at room temperature. These weak absorption lines have been detected by using the wavelength modulation spectroscopy technique with second-harmonic detection. The broadening and shifting coefficients have been obtained for ten absorption lines by fitting the collected second-harmonic absorption features and varying the pressure of different buffer gases.