Abstract
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.
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References
Herzberg G 1967Molecular spectra and molecular structure III, electronic spectra and electronic structure of polyatomic molecule (England: Van Nostrand Co.) p. 519
Job V A, Sethuraman V and Innes K K 1969J. Mol. Spectrosc. 30 365
Kritchman E, Shtrikman S and Slatkine M 1978J. Opt. Soc. Am. 68 1257
Patel C K N and Tam A C 1981Rev. Mod. Phys. 53 517
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Ravi Kumar, A.V., Padmaja, G., Nampoori, V.P.N. et al. Photoacoustic detection of two photon absorption in formaldehyde using pulsed dye laser. Pramana - J Phys 33, L621–L626 (1989). https://doi.org/10.1007/BF02845813
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DOI: https://doi.org/10.1007/BF02845813