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Pramana

, Volume 33, Issue 5, pp L621–L626 | Cite as

Photoacoustic detection of two photon absorption in formaldehyde using pulsed dye laser

  • A V Ravi Kumar
  • G Padmaja
  • V P N Nampoori
  • C P G Vallabhan
Rapid Communications

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.

Keywords

Two photon absorption photoacoustic spectrum overtone absorption 

PACS Nos

33.50 33.10 

References

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Copyright information

© Indian Academy of Sciences 1989

Authors and Affiliations

  • A V Ravi Kumar
    • 1
  • G Padmaja
    • 1
  • V P N Nampoori
    • 1
  • C P G Vallabhan
    • 1
  1. 1.Laser Division, Department of PhysicsCochin University of Science and TechnologyCochinIndia

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