Accession Number : AD0786768

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

Descriptive Note : Progress rept. 1 Jan-1 Oct 74,

Corporate Author : MISSOURI UNIV ROLLA

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

Report Date : 01 OCT 1974

Pagination or Media Count : 100

Abstract : The optical emission from additive impurity ions in a fast flowing helium afterglow created in a Penning ionizing collision with helium metastable atoms has been examined in the spectral range 2000-6000A. If the helium metastable atoms are optically oriented, the resulting spin conservation induces an equivalent polarization in the Penning ions and electrons. The polarization transfer to a variety of ions has been investigated, and techniques have been developed to observe the magnetic resources of excited atomic and molecular ions. The lifetimes of the rotational levels of the A doublet Sigma state of CO(+) and the B doublet Sigma(-) state of CH have been measured. The effects of level crossings and tunneling on lifetimes of the states have been observed and the predissociation probabilities measured. Lifetimes of the lower vibronic levels of the singlet A2 state of formaldehyde have been measured. Lifetime and pressure quenching slopes agree with earlier work. Long lifetime cascade components were also observed in this system. (Author)

Descriptors :   *Emission spectra, *Metals, Atomic spectra, Ions, Afterglows, Molecular energy levels, Atomic energy levels, Quenching(Inhibition), Electronic states, Atoms, Helium, Particle collisions, Charge transfer, Impurities, Nuclear spins, Magnetic resonance, Polarization, Carbon monoxide, Formaldehyde, Excitation, Metastable state

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE