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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 12
BKCSDE 31(12)
December 20, 2010 

 
Title
Femtosecond photoelectron imaging of N2 at 410 nm
Author
Wei Guo*, Shanshan Wei, Xingqiang Lu, Li Wang
Keywords
Multiphoton ionization, Two-step model, Rydberg states, Ponderomotive potential, Resonant/ nonresonant population transfer, Channel closure
Abstract
We experimentally measure the kinetic energy and angular distributions of photoelectrons of N2 as a function of 410 nm femtosecond laser intensity by using velocity map imaging technique. The strong-field multiphoton ionization of molecules shares many of the characteristics with those of atoms. Electron kinetic energies are nearly independent of laser intensities. The independence suggests that the electron peaks in the photoelectron spectrum actually result from a twostep process, indicative of the occurrence of real population in the intermediate states. The relative amplitudes of electron peaks indicate that in the two-step process, nonresonant population transfer dominates for low intensities, while resonant population transfer dominates for higher intensities.
Page
3693 - 3696
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