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We describe a technique for determining Nfl by measuring the group-velocity delay of a probe laser beam propagating through a vapor. This diagnostic has wide dynamic range, is simple to implement, and can be used as a high-bandwidth vapor rate monitor. In addition, it can be used to measure column density, Nl, number density, N, oscillator strengths, f, or absorption cross sections, collisional line broadening, and vapor group-velocity delay.

No abstract

Thisis apreprintof apaperintendedforpublicationina joumalorproceedings. Since changes may be made before publication, this preprint is made available with the understanding that it will not be cited or reproduced without the permission of the author. A DISCLAIMER This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California, nor any of their employees makes any warranty, express or impIied, or assumes any le a1 liability or responsibility for the or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial roducts, rocess, f t " 2

No abstract