Laser Stark saturation spectroscopy of the ν2 band of CD 3l

Abstract

The Q P(4) transitions of the ν 2 band of 12CD 3I, which lie close to the P(16) 10.4-μm CO 2 laser line, have been observed by saturation spectroscopy using both an intracavity Stark cell, and a Shimizu-type multipass arrangement. Since both level crossing and Lamb dip signals can be seen using these transitions, they serve to illustrate both the uses of the two types of Stark cell, and also the differences between the two kinds of nonlinear signals. A simple derivation of the quadrupole matrix elements in the uncoupled basis is given. The dipole moments of the molecule in the ground and ν 2 states were determined to be 1.656 2 and 1.652 3 D, from the measurements of the very sharp intracavity level crossing signals.