TY - JOUR
T1 - Vacuum-ultraviolet emission from proton-excited helium gas
AU - Stewart, T. E.
AU - Hurst, G. S.
AU - Bartell, D. M.
AU - Parks, J. E.
PY - 1971
Y1 - 1971
N2 - Vacuum-ultraviolet (vuv) studies were made of the emission from helium gas excited by 4-MeV protons, under conditions where the gas purity was monitored by concomitant total-ionization measurements. The relative intensity of the 584- resonance line was studied from 0.01 to 100 Torr. Three continua, near 600, 675, and 800, respectively, were investigated from a few Torr to 800 Torr. Our studies of intensity as a function of pressure are consistent with the interpretation that the 675- continuum is the bound-continuum transition Du+1→Xg+1 in the helium diatomic molecule, where the D state is formed by three-body collisions involving the atomic 2P1 state. Some of the 800- continuum, as well as the narrow continuum near 600, is produced, most likely, from a similar process involving emission from the Au+1 molecular state, created from three-body conversion of a 2S1 atomic state. Certain other details are given on the energy pathways following charged-particle excitation of helium gas, and comments are made on some of the recently published emission data for liquid helium.
AB - Vacuum-ultraviolet (vuv) studies were made of the emission from helium gas excited by 4-MeV protons, under conditions where the gas purity was monitored by concomitant total-ionization measurements. The relative intensity of the 584- resonance line was studied from 0.01 to 100 Torr. Three continua, near 600, 675, and 800, respectively, were investigated from a few Torr to 800 Torr. Our studies of intensity as a function of pressure are consistent with the interpretation that the 675- continuum is the bound-continuum transition Du+1→Xg+1 in the helium diatomic molecule, where the D state is formed by three-body collisions involving the atomic 2P1 state. Some of the 800- continuum, as well as the narrow continuum near 600, is produced, most likely, from a similar process involving emission from the Au+1 molecular state, created from three-body conversion of a 2S1 atomic state. Certain other details are given on the energy pathways following charged-particle excitation of helium gas, and comments are made on some of the recently published emission data for liquid helium.
UR - http://www.scopus.com/inward/record.url?scp=35949041106&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.3.1991
DO - 10.1103/PhysRevA.3.1991
M3 - Article
AN - SCOPUS:35949041106
SN - 1050-2947
VL - 3
SP - 1991
EP - 1997
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 6
ER -