Hydrogen Lyman-α and Lyman-β emissions from high-pressure microhollow cathode discharges in Ne-H2 mixtures

P. Kurunczi, H. Shah, K. Becker

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Abstract

We observed intense emission of the atomic hydrogen Lyman-α (121.6 nm) and Lyman-β (102.5 nm) lines from microhollow cathode discharges in high-pressure Ne (740 Torr) with a small admixture of H2(up to 3 Torr). The atomic emission lines are spectrally clean with essentially no background of molecular emissions from the H2 Lyman and Werner bands. We attribute these atomic emissions to near-resonant energy transfer processes in the high-pressure discharge. In one case, near-resonant energy transfer between the Ne2 * excimer and H2 leads to the formation of H(n = 2) atoms, a process similar to what was observed recently by Wieser et al (1998 J. Phys. B: At. Mol. Opt. Phys. 31 4589) in a high-pressure Ne/H2 mixture excited by energetic ion and electron impact. In the other case, near-resonant energy transfer between excited Ne* atoms (or vibrationally excited neon excimer molecules) and H2 leads to the formation of H(n = 3) atoms. The ratio of Lyman-α to Lyman-β emission intensity depends on the operating parameters of the discharge (gas pressure, gas mixture, discharge current) which supports the notion that different processes are involved in the formation of the H(n = 2) and H(n = 3) atoms, respectively.

Original languageEnglish (US)
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume32
Issue number22
DOIs
StatePublished - Nov 28 1999

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cathodes
hydrogen
energy transfer
excimers
atoms
ion impact
admixtures
neon
electron impact
gas pressure
gas mixtures
molecules

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Atomic and Molecular Physics, and Optics

Cite this

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title = "Hydrogen Lyman-α and Lyman-β emissions from high-pressure microhollow cathode discharges in Ne-H2 mixtures",
abstract = "We observed intense emission of the atomic hydrogen Lyman-α (121.6 nm) and Lyman-β (102.5 nm) lines from microhollow cathode discharges in high-pressure Ne (740 Torr) with a small admixture of H2(up to 3 Torr). The atomic emission lines are spectrally clean with essentially no background of molecular emissions from the H2 Lyman and Werner bands. We attribute these atomic emissions to near-resonant energy transfer processes in the high-pressure discharge. In one case, near-resonant energy transfer between the Ne2 * excimer and H2 leads to the formation of H(n = 2) atoms, a process similar to what was observed recently by Wieser et al (1998 J. Phys. B: At. Mol. Opt. Phys. 31 4589) in a high-pressure Ne/H2 mixture excited by energetic ion and electron impact. In the other case, near-resonant energy transfer between excited Ne* atoms (or vibrationally excited neon excimer molecules) and H2 leads to the formation of H(n = 3) atoms. The ratio of Lyman-α to Lyman-β emission intensity depends on the operating parameters of the discharge (gas pressure, gas mixture, discharge current) which supports the notion that different processes are involved in the formation of the H(n = 2) and H(n = 3) atoms, respectively.",
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AU - Shah, H.

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N2 - We observed intense emission of the atomic hydrogen Lyman-α (121.6 nm) and Lyman-β (102.5 nm) lines from microhollow cathode discharges in high-pressure Ne (740 Torr) with a small admixture of H2(up to 3 Torr). The atomic emission lines are spectrally clean with essentially no background of molecular emissions from the H2 Lyman and Werner bands. We attribute these atomic emissions to near-resonant energy transfer processes in the high-pressure discharge. In one case, near-resonant energy transfer between the Ne2 * excimer and H2 leads to the formation of H(n = 2) atoms, a process similar to what was observed recently by Wieser et al (1998 J. Phys. B: At. Mol. Opt. Phys. 31 4589) in a high-pressure Ne/H2 mixture excited by energetic ion and electron impact. In the other case, near-resonant energy transfer between excited Ne* atoms (or vibrationally excited neon excimer molecules) and H2 leads to the formation of H(n = 3) atoms. The ratio of Lyman-α to Lyman-β emission intensity depends on the operating parameters of the discharge (gas pressure, gas mixture, discharge current) which supports the notion that different processes are involved in the formation of the H(n = 2) and H(n = 3) atoms, respectively.

AB - We observed intense emission of the atomic hydrogen Lyman-α (121.6 nm) and Lyman-β (102.5 nm) lines from microhollow cathode discharges in high-pressure Ne (740 Torr) with a small admixture of H2(up to 3 Torr). The atomic emission lines are spectrally clean with essentially no background of molecular emissions from the H2 Lyman and Werner bands. We attribute these atomic emissions to near-resonant energy transfer processes in the high-pressure discharge. In one case, near-resonant energy transfer between the Ne2 * excimer and H2 leads to the formation of H(n = 2) atoms, a process similar to what was observed recently by Wieser et al (1998 J. Phys. B: At. Mol. Opt. Phys. 31 4589) in a high-pressure Ne/H2 mixture excited by energetic ion and electron impact. In the other case, near-resonant energy transfer between excited Ne* atoms (or vibrationally excited neon excimer molecules) and H2 leads to the formation of H(n = 3) atoms. The ratio of Lyman-α to Lyman-β emission intensity depends on the operating parameters of the discharge (gas pressure, gas mixture, discharge current) which supports the notion that different processes are involved in the formation of the H(n = 2) and H(n = 3) atoms, respectively.

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