Femtosecond laser studies of molecular wavepacket dynamics in the cesium dimer
Rodriguez, George
This item is only available for download by members of the University of Illinois community. Students, faculty, and staff at the U of I may log in with your NetID and password to view the item. If you are trying to access an Illinois-restricted dissertation or thesis, you can request a copy through your library's Inter-Library Loan office or purchase a copy directly from ProQuest.
Permalink
https://hdl.handle.net/2142/22033
Description
Title
Femtosecond laser studies of molecular wavepacket dynamics in the cesium dimer
Author(s)
Rodriguez, George
Issue Date
1993
Doctoral Committee Chair(s)
Eden, James G.
Department of Study
Electrical and Computer Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Chemistry, Physical
Physics, Molecular
Physics, Optics
Language
eng
Abstract
Femtosecond laser pump-probe experiments have been applied to the study of vibrational wavepacket dynamics in the excited states of the cesium dimer, Cs$\sb2.$ The real-time vibrational motion of the molecule is observed by probing the quantum motion of the wavepacket on a potential surface by a pair of time-delayed ultrafast laser pulses. Specifically, pumping the $\rm C(\sp1\Pi\sb{u})\gets X(\sp1\Sigma\sb{g}\sp+)\ Cs\sb2$ band at several wavelengths between 627 nm and 650 nm produces a wavepacket with an oscillation period of $\sim$1.15 psec. The wavepacket is detected by photoionizing the excited molecule with a time-delayed probe pulse. The wavepacket oscillations persist for approximately 20 psec, and their decay is attributed to the dephasing of the vibrational wavefunctions that comprise the wavepacket.
Using the Fast Fourier Transform (FFT) spectral method, numerical quantum calculations of the time dependent Schrodinger equation have been performed to simulate the time evolution of the wavepacket density. The wavepacket simulations reproduce the experimentally observed oscillations, and can be used to describe the classical motion of the molecule.
Use this login method if you
don't
have an
@illinois.edu
email address.
(Oops, I do have one)
IDEALS migrated to a new platform on June 23, 2022. If you created
your account prior to this date, you will have to reset your password
using the forgot-password link below.