Accession Number:

AD0698509

Title:

FLUORESCENCE EFFICIENCIES OF NITROGEN EXCITED BY 1- to 5-MeV POSITIVE IONS,

Descriptive Note:

Corporate Author:

LOS ALAMOS SCIENTIFIC LAB N MEX

Personal Author(s):

Report Date:

1969-12-22

Pagination or Media Count:

14.0

Abstract:

Fluorescence efficiencies for excitation of nitrogen by 1- to 5-MeV positive ions have been measured at pressures of 2 to 19 Torr. Power output in the 3914-A 0,0 band of the N2 first negative system was measured with an interference-filter photometer, and efficiencies for production of this band at lower pressure were calculated from the collisional deactivation rate. For Ne, O, N2, and O2 ions with various initial velocities the low pressure efficiencies so determined were in the range 0.4 to 0.6. Spectra of the nitrogen emission in the 3400- to 7800-A range were recorded. N2 first negative bands and N2 first positive and second positive bands were prominent in the spectra. Nearly all the first negative emission originated in the v 0 upper vibrational state. Most of the second positive emission was in the v 0 to 2 band sequences. Spectral intensities were corrected for effects of collisional quenching, to obtain low-pressure relative efficiencies. Efficiencies for nine second positive bands were determined relative to the 3914-A efficiencies for excitation by N, Ne, N2, and Kr ions with energies of 4 to 5 MeV. After corrections for collisional quenching, the spectral distribution of nitrogen fluorescence excited by ions is similar to that in spectra obtained by Hartman for excitation of air by 850-eV electrons. Author

Subject Categories:

  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE