Accession Number : AD0749366

Title :   Radiofrequency Spectroscopy of Penning Ions: Measurement of Ion and Molecular Lifetimes.

Descriptive Note : Technical progress rept. no. 1, 1 Mar-31 Aug 72,

Corporate Author : MISSOURI UNIV ROLLA DEPT OF PHYSICS

Personal Author(s) : Schearer,Laird D. ; Anderson,Richard A.

Report Date : 31 AUG 1972

Pagination or Media Count : 70

Abstract : Collisions of impurity species with optically oriented helium metastable atoms in a flowing afterglow yield ensembles of excited atomic and molecular ions by Penning ionization. Conservation of both the longitudinal and transverse components of the spin angular moment in the collision has been demonstrated. Radiofrequency spectroscopy of the excited ions yielded radiative lifetimes. The authors have also demonstrated that the excited ions are coherently excited, and they have derived theoretically the conditions for the coherence transfer. The technique exploited here also can be used to produce beams of polarized ions and electrons for scattering experiments. Also measured was the variation in lifetimes and predissociation probabilities of OH, CH, and NH.

Descriptors :   (*IONS, *MOLECULAR ENERGY LEVELS), (*RADIOFREQUENCY SPECTROSCOPY, IONS), GAS IONIZATION, RELAXATION TIME, HELIUM, MOLECULAR BEAMS, EXCITATION, POLARIZATION

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE