Abstract

Characteristic peculiarities of the formation of the photoacoustic-detector signal from excitation of absorbing gas molecules by a short laser pulse (τ_p ≪ τ_vt) that allows for the natural oscillations of the microphone membrane are considered. A technique for τ_vt measurement is proposed on the strength of the finding that the signal form is determined by the microphone membrane oscillation under low pressure (P ≤ 10 Torr). The results of measurement of the τ_vt of the vibrational state ν₁ + 3ν₃ in H₂O for the collisions H₂O–H₂O and H₂O–air are presented.

© 1995 Optical Society of America

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