The Los Alamos air fluorescence detection system

Westervelt, D.R.; Hoerlin, Herman

doi:10.1109/proc.1965.4484

Cited by 10 publications

(2 citation statements)

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“…4 ' 5 The lightning spectrum was not known quantitatively; however, it was known qualitatively. that, in contrast to the continuum-free molecular band radiation .of air fluorescence, lightning radiates a strong continuum, as well a~ atomic-line .and, perhaps, molecular-band features.…”

Section: Disclaimermentioning

confidence: 99%

The 1965 Arpa-Aec Joint Lightning Study at Los Alamos. Volume Iv. Discrimination Against False Triggering of Air-Fluorescence Detection Systems by Lightning.

Barasch¹

1968

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Section: Disclaimermentioning

confidence: 99%

The 1965 Arpa-Aec Joint Lightning Study at Los Alamos. Volume Iv. Discrimination Against False Triggering of Air-Fluorescence Detection Systems by Lightning.

Barasch¹

1968

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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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