Laser Chemistry

Laser Chemistry / 1987 / Article

Open Access

Volume 7 |Article ID 253698 |

D. S. Bomse, S. Dougal, "Multiphoton Ionization of Formaldehyde: Observation of 3py and 3pz Rydberg States", Laser Chemistry, vol. 7, Article ID 253698, 6 pages, 1987.

Multiphoton Ionization of Formaldehyde: Observation of 3py and 3pz Rydberg States

Received28 Apr 1986
Accepted22 Jul 1986


Multiphoton ionization (MPI) of CH2O and CD2O is reported for dye laser wavelengths between 445 and 470 nm. The ionization pathway starts with three-photon resonant absorption to 3py and 3pz Rydberg states. One or two additional photons are required, depending on wavelength, to reach threshold. MPI spectra agree well with VUV absorption measurements of the same Rydberg levels. MPI yields are small and photoacoustic measurements imply the initial three-photon excitation has low probability. Transitions at the four-photon ionization threshold show larger cross sections than the (overall) five-photon ionization bands but hot band transitions were not observed following selective vibrational excitation of ground state molecules.

Copyright © 1987 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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