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Two photon absorption; photoacoustic spectrum; overtone absorption

Absorption spectra of formaldehyde molecule in the gas phase have been recorded using photoacoustic (PA) technique with pulsed dye laser at various power levels. The spectral profiles at higher power levels are found to be different from that obtained at lower laser powers. Two photon absorption (TPA) is found to be responsible for the photoacoustic signal at higher laser power while the absorption at lower laser power level is attributed to one photon absorption (OPA) process. Probable assignments for the different transitions are given in this paper.

A V Ravi Kumar¹ G Padmaja¹ V P N Nampoori¹ C P G Vallabhan¹

1. Laser Division, Department of Physics, Cochin University of Science and Technology, Cochin - 682 022, India

Published

November 1989

Manuscript received

31 July 1989

Manuscript revised

31 August 1989