S. Bashkin, D. Fink, P. R. Malmberg, A. B. Meinel, and S. G. Tilford, "Collisional Excitation of Atomic Spectra in Accelerated Beams of Light Elements," J. Opt. Soc. Am. 56, 1064-1075 (1966)
The light emitted by high-speed particles produced by a Van de Graaff accelerator and excited by passage through a thin foil of carbon has been studied in the wavelength range 2700–6600 Å. Lines from deuterium, helium, nitrogen, and oxygen are presented including some that have not previously been reported. Qualitative observations are presented on the mean lives of the excited states and on the dependence of spectral line intensity upon particle energy.
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Observed helium lines and comparison with He ii in the compilation by Moore.a
Measured wavelength (Å)
Relative intensity
Identification
Transition
Wavelength (Å)
2732±2
weak
3–6
2733
3203±2
strong
3–5
3203
4684±2
strong
3–4
4686
5414±3
very weak
4–7
5412
6561±3
very weak
4–6
6560
Reference 12. The wavelength for the 3–6 transition, which is not included in Ref. 12, is a calculated value which agrees with that reported by J. D. Garcia and J. E. Mack, J. Opt. Soc. Am. 55, 666 (1965).
Table IV
Observed nitrogen lines and comparison with the compilation by Moore.a
See Ref. 12.
Doppler shift corrections have been applied. Lines shorter than 3780 Å were measured in second order. A few of these lines were observed in. first order also. The uncertainties of the wavelength measurements are about ±2 Å for the stronger unblended lines with medium-to-long relative lifetimes and somewhat greater for the other lines.
Relative observed intensities (eye estimates from plate densities) for
, 1, and 2 MeV atom energies, respectively, with the abbreviations: S—strong, M—medium, W—weak, and VW—very weak.
Relative lifetimes given by abbreviations: L—long, M—medium, S—short, and VS—very short. The long lifetimes are probably of the order of 10−3 sec, and the very short lifetimes are probably less than 10−9 sec; however, the designations are not intended as a quantitative measurement.
Numbers in the classification columns give multiplet identification based on wavelengths in the compilation by Moore (Ref. 12) for N ii, N iii, N iv, and N v, respectively. The wavelength range listed is that for all tabulated lines (for N ii, N iii, N iv, and N v) within the assumed uncertainty of the wavelength measurements given in the first column. Especially note that multiplet identification is based only on the observed wavelength and not upon other information which may be at variance with the multiplet choice. Some pertinent experimental results supplementing Moore’s compilation are indicated in the classification columns by letters E and H. The letter E refers to K. B. S. Eriksson, Arkiv Fysik 13, 303 (1958); and H refers to R. Hallin, Arkiv Fysik 31, 511 (1966); 32, 201 (1966).
The symbol Q in the classification columns indicates that the line contained this charge component as indicated by the separate charge identification measurements (Ref. 7).
The two pairs of lines indicated by the brackets were not resolved except in the charge separation experiment. The energy dependence of the intensity and the lifetime apply to the unresolved combination.
Table V
Observed oxygen lines and comparison with the compilation by Moore.a
See Ref. 12.
Doppler shift corrections have been applied. Lines shorter than 3770 Å were measured in second order. The uncertainties of the wavelength measurements are about ±2 Å for the stronger unblended lines with medium-to-long relative lifetimes and somewhat greater for other lines.
Relative observed intensities (eye estimates from plate densities) for 1- and 2-MeV atom energies, respectively, with the abbreviations: S—strong, M—medium, W—weak, and VW—very weak.
Relative lifetimes given by abbreviations: L—long, M—medium, S—short, and VS—very short. The long lifteimes are probably of the order of 10−8 sec, and the very short lifetimes are probably less than 10−9 sec; however, the designations are not intended as a quantitative measurement.
Numbers in the classification columns give multiplet identification based on wavelengths in the compilation by Moore (Ref. 12) for O ii, O iii, O iv, and O v, respectively. The wavelength range listed is that for all tabulated lines (for O ii, O iii, O iv, and O v) within the assumed uncertainty of the wavelength measurements given in the first column. Especially note that multiplet identification is based only on the observed wavelength and not upon other information which may be at variance with the multiplet choice. Some pertinent experimental results supplementing Moore’s compilation are indicated in the O v column by the letter B. This refers to K. Bockasten, R. Hallin, K. B. Johansson, and P. Tsui, Phys. Letters 8, 181 (1964) supplemented by a private communication from K. Bockasten.
Observed helium lines and comparison with He ii in the compilation by Moore.a
Measured wavelength (Å)
Relative intensity
Identification
Transition
Wavelength (Å)
2732±2
weak
3–6
2733
3203±2
strong
3–5
3203
4684±2
strong
3–4
4686
5414±3
very weak
4–7
5412
6561±3
very weak
4–6
6560
Reference 12. The wavelength for the 3–6 transition, which is not included in Ref. 12, is a calculated value which agrees with that reported by J. D. Garcia and J. E. Mack, J. Opt. Soc. Am. 55, 666 (1965).
Table IV
Observed nitrogen lines and comparison with the compilation by Moore.a
See Ref. 12.
Doppler shift corrections have been applied. Lines shorter than 3780 Å were measured in second order. A few of these lines were observed in. first order also. The uncertainties of the wavelength measurements are about ±2 Å for the stronger unblended lines with medium-to-long relative lifetimes and somewhat greater for the other lines.
Relative observed intensities (eye estimates from plate densities) for
, 1, and 2 MeV atom energies, respectively, with the abbreviations: S—strong, M—medium, W—weak, and VW—very weak.
Relative lifetimes given by abbreviations: L—long, M—medium, S—short, and VS—very short. The long lifetimes are probably of the order of 10−3 sec, and the very short lifetimes are probably less than 10−9 sec; however, the designations are not intended as a quantitative measurement.
Numbers in the classification columns give multiplet identification based on wavelengths in the compilation by Moore (Ref. 12) for N ii, N iii, N iv, and N v, respectively. The wavelength range listed is that for all tabulated lines (for N ii, N iii, N iv, and N v) within the assumed uncertainty of the wavelength measurements given in the first column. Especially note that multiplet identification is based only on the observed wavelength and not upon other information which may be at variance with the multiplet choice. Some pertinent experimental results supplementing Moore’s compilation are indicated in the classification columns by letters E and H. The letter E refers to K. B. S. Eriksson, Arkiv Fysik 13, 303 (1958); and H refers to R. Hallin, Arkiv Fysik 31, 511 (1966); 32, 201 (1966).
The symbol Q in the classification columns indicates that the line contained this charge component as indicated by the separate charge identification measurements (Ref. 7).
The two pairs of lines indicated by the brackets were not resolved except in the charge separation experiment. The energy dependence of the intensity and the lifetime apply to the unresolved combination.
Table V
Observed oxygen lines and comparison with the compilation by Moore.a
See Ref. 12.
Doppler shift corrections have been applied. Lines shorter than 3770 Å were measured in second order. The uncertainties of the wavelength measurements are about ±2 Å for the stronger unblended lines with medium-to-long relative lifetimes and somewhat greater for other lines.
Relative observed intensities (eye estimates from plate densities) for 1- and 2-MeV atom energies, respectively, with the abbreviations: S—strong, M—medium, W—weak, and VW—very weak.
Relative lifetimes given by abbreviations: L—long, M—medium, S—short, and VS—very short. The long lifteimes are probably of the order of 10−8 sec, and the very short lifetimes are probably less than 10−9 sec; however, the designations are not intended as a quantitative measurement.
Numbers in the classification columns give multiplet identification based on wavelengths in the compilation by Moore (Ref. 12) for O ii, O iii, O iv, and O v, respectively. The wavelength range listed is that for all tabulated lines (for O ii, O iii, O iv, and O v) within the assumed uncertainty of the wavelength measurements given in the first column. Especially note that multiplet identification is based only on the observed wavelength and not upon other information which may be at variance with the multiplet choice. Some pertinent experimental results supplementing Moore’s compilation are indicated in the O v column by the letter B. This refers to K. Bockasten, R. Hallin, K. B. Johansson, and P. Tsui, Phys. Letters 8, 181 (1964) supplemented by a private communication from K. Bockasten.
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