Accession Number:

AD0614553

Title:

OPTICAL DETECTION OF MICROWAVE TRANSITIONS BETWEEN EXCITED ELECTRONIC STATES OF CN AND THE IDENTIFICATION OF THE TRANSITIONS INVOLVED,

Descriptive Note:

Corporate Author:

NATIONAL BUREAU OF STANDARDS BOULDER COLO

Personal Author(s):

Report Date:

1964-07-10

Pagination or Media Count:

6.0

Abstract:

Thirteen microwave transitions in the frequency range from 8800 to 9900 MHz have been observed between excited electronic states of CN. These correspond to all allowed transitions, delta F 0, 1, in the K 4 perturbation complex between the three hyperfine levels of the unperturbed component of the lambda doublet of the A 2II sub 3 32 v 10 level and the three hyperfine levels in each of the perturbed and the unperturbed components of the spin doublet of the B 2 sigma v 0 level. The identification of all allowed transitions permits a unique determination of nine of the 12 hyperfine energy levels of this perturbation complex. The measured energy separation in this level of the 2 sigma state is interpreted in terms of the electronic structure of the CN molecule in the following paper. The experiment is the first microwave measurement of the fine and hyperfine structure of an excited electronic state of a molecule and also is the first accurate measurement of the hyperfine structure of a 2 sigma state. CN was produced predominantly in the metastable A 2II state by a chemical reaction when methylene chloride was added to a nitrogen afterglow. Resonant microwave pumping from the II state increased the population of the three hyperfine levels of each sigma state by 0.1 to 5. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE