TITLE

Population transfer to excited vibrational levels of H2 molecule by stimulated hyper-Raman passage with chirped laser pulses

AUTHOR(S)
Sarkar, Chitrakshya; Bhattacharya, Rangana; Bhattacharyya, S. S.; Saha, Samir
PUB. DATE
September 2007
SOURCE
Journal of Chemical Physics;9/14/2007, Vol. 127 Issue 10, p104304
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have theoretically investigated the population transfer from the initial ground rovibrational level vg=0, Jg=0 to the final rovibrational levels vf=1,2, Jf=0 of the ground electronic state X 1Σg+ via the resonant intermediate level vi=6, Ji=0 of the excited electronic state EF 1Σg+ of H2 molecule by (2+2)-photon stimulated hyper-Raman passage (STIHRP). The density matrix technique has been employed to evaluate the population transfer to the final target levels using linearly chirped pump and Stokes laser pulses with different chirp rates. Both the pulses are considered to have the same temporal shape, pulse width, and linear parallel polarizations. We have studied in detail the dependence of the population transfer on the set of laser parameters for pulse (peak) intensities in the ranges of 1.5×1011–1.0×1012 and 1.0×1012–7.0×1012 W/cm2. The corresponding pulse widths (full width at half maximum) are of the order of 115–200 and 15–30 ps. We have found that the chirp rate parameters can be optimized to achieve almost complete population transfer from the ground (g) to the final (f) target levels. This, to our knowledge, is the first application of a (2+2)-photon STIHRP process with chirpings to a model molecular system (H2). The study demonstrates the suitability of the chirped (2+2)-photon STIHRP technique for selective and almost total inversion of vibrational population in a diatomic molecule.
ACCESSION #
26644802

 

Related Articles

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics