Population inversion inferred from intensity measurements in stationary recombing He plasma

Journal Article · Mon Oct 24 04:00:00 EDT 1977 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.39.1074· OSTI ID:7282737

Sato, K; Shiho, M; Hosokawa, M; Sugawara, H; Oda, T; Sasaki, T

Stationary population inversion between the low excited states of He/sup +/ has been observed in a helium plasma in contact with neutral helium. The ratio of population densities as deduced from Lyman line intensities is n/sub 2//g/sub 2/:n/sub 3//g/sub 3/:n/sub 4//g/sub 4/:n/sub 5//g/sub 5/ = 1:06:1.1:1.2, where n/sub i//g/sub i/ is the population density with the principal quantum number i. The mechanism leading to the population inversion is discussed.

• Research Organization: Institute of Plasma Physics, Nagoya University, Nagoya 464, Japan
• OSTI ID: 7282737
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 39:17; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
CATIONS
CHARGED PARTICLES
ELECTROMAGNETIC RADIATION
EMISSION
EMISSION SPECTRA
ENERGY-LEVEL TRANSITIONS
EXTREME ULTRAVIOLET RADIATION
FAR ULTRAVIOLET RADIATION
GAS LASERS
HELIUM IONS
IONS
LASERS
PLASMA
POPULATION INVERSION
RADIATIONS
RECOMBINATION
SPECTRA
STIMULATED EMISSION
ULTRAVIOLET RADIATION