stark effect and torsional motion interaction in biphenyl l. h. coudert, a l. f. pacios, b and j....
TRANSCRIPT
Stark Effect and Torsional Motion
Interaction in Biphenyl
L. H. Coudert,a L. F. Pacios,b and J. Ortigosoc
aLISA, CNRS/Paris 12 University, Créteil, FrancebETSI Montes, Universidad Polytécnica de Madrid, Madrid, Spain
cIinstituto de Estructura de la Materia, CSIC, Serrano 121, Madrid, Spain
Overview
•The spectroscopy
•Stark interaction
•Alignment
Biphenyl is a non-rigid molecule
The torsional angle1 is 2
1. Merer and Watson, J. Mol. Spec. 47, 499 (1973)
z
x
y
The potential energy function
It has 90° periodicity
The potential energy function
eq.Pacios and Gómez, Chem.Phys. Letters 432, 414 (2006)
Torsional energy levels
Merer and Watson, J. Mol. Spec. 47, 499 (1973)
Stark interaction Hamiltonian
Polarizability tensor
Coupling between E and the large amplitude motion
Ramakrishna and Seideman, Phys. Rev. Letters 99, 103001 (2007)
Stark-rotation-torsion energy levels
Calculation I
Rigid case.
Non-rigid case
Kumar, Gross, Safvan, Rajgara, and Mathur, Phys. Rev. A 53, 3098 (1996)
E
Alignment
zZ
The stark interaction
energy is minimized
Calculation II
Rigid case.
Rigid case.
TK. Intensity = 3.6 1012 W·cm
<< |
Non-rigid case
Non-rigid case
TK. Intensity = 3.6 1012 W·cm
<< |
LaserBeam
Alignment rigid case
Zy
xz
LaserBeam
Alignment non-rigid case
Zy
xz
y
x
z
Non-rigid case: |
TK. No laser
TK. Intensity = 1013 W·cm
Non-rigid case: |