 
Summary: Volume 198,number 3,4 CHEMICAL PHYSICSLETTERS 9 October 1992
General restrictions for the relaxation constants
of the polarization moments of the density matrix
M.P. Auzinsh
The University ofLatvia, 226098, 19Rainis Boulevard, Rigu, Latvia
Received 26 March 1992;in final form 14July 1992
General inequalities for the relaxation constants of polarization moments are examined. Concrete numerical limitations for the
values of these constants are obtained.
In recent years it has been generally accepted to
characterize the distribution of the angular momen
tum j of atomic as well as molecular states in the
framework of the irreducible tensorial operators
PG. The state is described by means of polarization
moments p& which are the expansion coefficients of
the angular momentum density matrix pm,,,,on the
tensorial operators pz:
Polarization moments have a very clear physical
meaning. Thus a moment with rank K=O charac
terizes the population of the level, with X= 1the ori
entation, and with K=2 the alignment [ I].
