The Fluorescence of Air and Nitrogen Excited by Energetic Electrons

O'Neil, R. R.; Davidson, Gilbert

doi:10.21236/ad0673995

Cited by 8 publications

(4 citation statements)

References 2 publications

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“…This aspect has already been described in ref. [6]. Effects discussed in this publication like the nonlinear dependence of intensity of the NO* emission from beam current have also been observed in our experiments.…”

Section: Jinst 7 P11005supporting

confidence: 81%

“…Data from ref. [6] at 0, 30, 266 and 800 hPa show a good agreement over the pressure range which has been studied.…”

Section: Intensity Ratio Of the 337 Nm Emission Band For Nitrogen And...supporting

confidence: 54%

“…[5] and [12] but is in good agreement with data obtained in ref. [6] in which the nitrogen target was also operated in a flow mode.…”

Section: Jinst 7 P11005mentioning

confidence: 99%

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Fluorescence of nitrogen and air

Dandl¹,

Heindl²,

Ulrich³

2012

J. Inst.

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Electron beams with 12 keV particle energy were used to excite nitrogen and air. Light emission has been studied using two types of optical spectrometers and a calibrated silicon photo diode. The relative intensities of the nitrogen emission bands in air have been measured and compared with data from the literature. The intensity ratio of the v=0 to 0 emission of nitrogen at 337 nm in the second positive system between pure nitrogen and air was determined to 12.9 ± 0.6 for 800 hPa total pressure for the best gas purity achieved in the experiments. Potential underlying gas kinetic processes are discussed. A measurement of the absolute conversion efficiency of electron beam power into light in the 337 nm band of nitrogen is presented. Converting the result into the corresponding value for dry air leads to a value of (6.1 ± 0.5) 337 nm photons emitted per MeV electron beam energy deposited in air at 1000 hPa and room temperature. The corresponding value for 800 hPa is (8.1 ± 0.8)/MeV.

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Section: Jinst 7 P11005supporting

confidence: 81%

“…Data from ref. [6] at 0, 30, 266 and 800 hPa show a good agreement over the pressure range which has been studied.…”

Section: Intensity Ratio Of the 337 Nm Emission Band For Nitrogen And...supporting

confidence: 54%

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Fluorescence of nitrogen and air

Dandl¹,

Heindl²,

Ulrich³

2012

J. Inst.

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“…At higher energies some measurements are available. Data of O'Neil and Davidson in the range 3 -60 keV [43] are shown in the figure. Cross sections inferred from previous measurements of these authors with 50 keV electrons at high pressure [44] are significantly smaller and they will not be used in the present analysis.…”

Section: The First Negative Systemmentioning

confidence: 99%

The yield of air fluorescence induced by electrons

Arqueros

Blanco

Castellanos

et al. 2006

Astroparticle Physics

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The fluorescence yield for dry air and pure nitrogen excited by electrons is calculated using a combination of well-established molecular properties and experimental data of the involved cross sections. Particular attention has been paid to the role of secondary electrons from ionization processes. At high pressure and high energy, observed fluorescence turns out to be proportional to the ionization cross section which follows the Born-Bethe law. Predictions on fluorescence yields in a very wide interval of electron energies (eV -GeV) and pressures (1 and 1013 hPa) as expected from laboratory measurements are presented. Experimental results at energies over 1 MeV are in very good agreement with our calculations for pure nitrogen while discrepancies of about 20% are found for dry air, very likely associated to uncertainties in the available data on quenching cross sections. The relationship between fluorescence emission, stopping power and deposited energy is discussed.

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