New measurements of the fluorescence efficiency of air under electron bombardment

Hartman, Paul L.

doi:10.1016/0032-0633(68)90136-0

Cited by 46 publications

(9 citation statements)

References 6 publications

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“…1,2 These have mainly focused on emission from excited nitrogen and air 3,4 and from atmospheric nuclear weapons 5 testing, as well as upper atmosphere studies. 6 However, the development of powerful gasphase, e-beam-pumped exciplex lasers over the past 20 years has stimulated further investigations in this field, with reported determinations of the total and component process yields in some rare gas systems. 7 In several recent experimental investigations 8,9 absolute fluorescence yields of pulse electron-irradiated rare gas/halogen source gas mixtures (R/AX) for the RX* (B,C) states of XeBr* (Xe/CF 3 Br), 8 KrF* (Kr/SF 6 ), 9 and XeF* (Xe/SF 6 ) 9 have been measured.…”

Section: Introductionmentioning

confidence: 99%

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Absolute Fluorescence Yields from Electron-Irradiated Gases. 3. XeCl* and XeI*

1997

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The absolute total fluorescence yield for the XeCl* (B,C) 2Σ1/2 + → 2Σ1/2 + transition has been determined from pulse electron-irradiated Xe/CFCl3 gas mixtures. Since no experimental resolution of the two formation pathways was achieved, individual, unquenched limiting yields for the excited state, Xe* + CFCl3 → XeCl* + .CHCl2, G o* = 2.4 ± 0.6, and ionic recombination, Xe2 + + Cl- + Xe → XeCl* + 2Xe, G o + = 3.2 ± 0.5, reactions have been calculated by modeling the dependence of the total fluorescent yield on xenon and halide gas pressure. Analogous experiments were also conducted for the formation of the XeI* exciplex from the irradiation of Xe/CF3I gas mixtures. Individual values for the two component formation processes were again calculated from total gas yields, giving G o* = 0.31 ± 0.08 and G o + = 4.5 ± 0.6. These yields are compared to the predictions of current theoretical models, and the effects of alternate recombination pathways are discussed.

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Section: Introductionmentioning

confidence: 99%

“…+ AX f X -+ A thermal electron capture(3)R* + AX f RX* + A rare gas excited-state reaction (+ R f RX* + 2R three-body ionic recombination(6) …”

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confidence: 99%

Absolute Fluorescence Yields from Electron-Irradiated Gases. 3. XeCl* and XeI*

1997

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“…The fluorescent light is produced mostly in the near UV and 9 1995 American Institute of Physics 839 blue region. [1] Oda and others [2] pointed out that a cosmic ray cascade (known as an" extensive air shower) in the atmosphere would cause the air to glow along the path of the cascade. A detector made to observe the air glow induced by cosmic ray showers would be able to observe, event by event, the entire longitudinal cascade being developed in the atmosphere, a feat that ground arrays are unable to achieve.…”

Section: Introductionmentioning

confidence: 99%

Results from the fly’s eye experiment

Bird¹,

Corbató²,

Dai³

et al. 1995

AIP Conference Proceedings

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We report recently analyzed results on the energy spectrum, and composition of cosmic rays above 0.3 EeV. We observe a break in the spectrum at 3 EeV and a chan~ng composition. The results can be explained by ~ simple two component model: galactic cosmic rays dominated by heavy primaries and an extragalactic component dominated by light primaries. The observed isotropic arrival direction distribution is consistent with the predictions of this model. A 320 EeV event was also recorded.

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“…[2][3][4][5][6][7][8][9] In laboratory experiments here, Hartman 8 has obtained spectra of the emission of air at 70-p. pressure excited by 850-eV electrons and has measured efficiencies for some of the nitrogen bands, including the important 3914-A (0, 0) N 2 + first negative band. [2][3][4][5][6][7][8][9] In laboratory experiments here, Hartman 8 has obtained spectra of the emission of air at 70-p. pressure excited by 850-eV electrons and has measured efficiencies for some of the nitrogen bands, including the important 3914-A (0, 0) N 2 + first negative band.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence Efficiencies of Nitrogen Excited by 1–5-MeV Positive Ions

Dunn

Holland

1971

The Journal of Chemical Physics

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Fluorescence efficiencies for excitation of nitrogen by 1-5-MeV positive ions have been measured at pressures of 2-19 torr. Typically, N2 pressure of 3.6 torr was required to stop a beam of 4-MeV Ne+ in the 1.5-m-long collision chamber. Power output in the 3914-A (0,0) N2+ first negative band was measured with a photometer, and low-pressure efficiencies were calculated from the collisional deactivation rate. For Ne+, 0+, N+, N 2+, and O2+ ions with various initial velocities from 3.1 to S.3X lOS cm/sec, the low-pressure efficiencies were between 0.4% and 0.6%. 3914-A efficiencies were, for 2.0 and 3.4X10 8 cm/sec Kr+, 0.27% and 0.35%, and for 1.3SX10 9 cm/sec H+, 0.67%. Spectra of the nitrogen emission in the 3400-7800-A range were recorded. N2+ first negative and N2 first and second positive bands were prominent, with most first negative in the v/=O vibrational sequence, and most second positive in the v'=0-2 sequences. The spectra were corrected for collisional quenching and low-pressure efficiencies were determined relative to the 3914-A band. For 4-5-MeV, N+, Ne+, N 2 +, and Kr+, total efficiencies for the second positive v'=0-2 sequences were about 1.5 times the 3914-A efficiencies. Efficiencies were determined for 10 first positive bands of the v'=2 to 7 sequences excited by 4.7S-MeV Ne+; the (2,0) and (3, 1) band efficiencies, for example, were about one-fourth the 3914-A efficiency of 0.52%. The nitrogen fluorescence excited by the ions has a spectral intensity distribution similar to those observed by Hartman for SSO-eV electrons in air and by Mitchell for J .S-keV x rays in N2•

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New measurements of the fluorescence efficiency of air under electron bombardment

Cited by 46 publications

References 6 publications

Absolute Fluorescence Yields from Electron-Irradiated Gases. 3. XeCl* and XeI*

Absolute Fluorescence Yields from Electron-Irradiated Gases. 3. XeCl* and XeI*

Results from the fly’s eye experiment

Fluorescence Efficiencies of Nitrogen Excited by 1–5-MeV Positive Ions

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