Spectral line intensities of a helium glow-discharge plasma were measured, and relative populations of the excited levels were calculated for various pressures from 0.842 to 2.83 mm Hg and currents from 3 to 40 ma.
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Note. Random errors in measurements are±0.5% unless specified after population.
Populations calculated from data of Hylleraas [Z. Physik 106, 395 (1937)].
Table III
Ratio of field strength to reduced pressure at various currents and pressures.
Pressure at room temp. in mm Hg
Pressure (P0) at 0°C in mm Hg
Discharge current in ma
Field strength (E) in v/cm
E/P0
0.842
0.765
3
8.97
11.7
5
8.46
11.1
10
7.82
10.2
20
7.44
9.73
40
7.05
9.23
1.65
1.51
3
9.1
6.02
5
8.59
5.68
10
8.08
5.35
20
7.77
5.15
40
7.44
4.92
2.36
2.16
3
9.61
4.45
5
9.10
4.21
10
8.93
4.13
40
8.21
3.80
2.83
2.59
3
10.12
3.91
5
9.74
3.76
10
9.48
3.65
20
9.10
3.52
Table IV
Random and drift velocities.
E/P0
Random velocity in cm/sec
Drift velocity in cm/sec
Drift/random velocities
3.5
1.2×108
2.1×106
0.017
11
1.4×108
6×106
0.043
Table V
Relative population variation with pressure based on equilibrium at calculated electron temperature.
Pressure in mm Hg
Electron temperature in deg C
ΔN/N for ΔE of 2×104 cm−1
0.842
60 000
0.479
1.65
45 000
0.639
2.36
39 000
0.737
2.83
36 500
0.787
Table VI
Calibration random uncertainty due to fluctuations in detection system and interpolation of wavelength scale.
Wavelength A
Error±%
Wavelength A
Error±%
7281
1.5
4143
1.0
7065
1.0
3964
1.0
6678
0.5
3937
1.0
5875
0.5
3926
1.0
5047
1.0
3888
0.5
5015
0.5
3819
1.0
4921
1.0
3652
1.0
4713
1.5
3634
1.0
4471
1.0
3613
1.0
4437
1.0
3447
1.5
4387
1.0
3188
2.0
4169
1.0
Table VII
Uncertainty in discharge tube current at various currents.
Current ma
% uncertainty in current
3
±0.3
5
0.2
10
0.1
20
0.5
40
0.25
Tables (7)
Table I
Relative transition probabilities from oscillator strengths of Trefftz et al.7 and Hylleraas.8
Note. Random errors in measurements are±0.5% unless specified after population.
Populations calculated from data of Hylleraas [Z. Physik 106, 395 (1937)].
Table III
Ratio of field strength to reduced pressure at various currents and pressures.
Pressure at room temp. in mm Hg
Pressure (P0) at 0°C in mm Hg
Discharge current in ma
Field strength (E) in v/cm
E/P0
0.842
0.765
3
8.97
11.7
5
8.46
11.1
10
7.82
10.2
20
7.44
9.73
40
7.05
9.23
1.65
1.51
3
9.1
6.02
5
8.59
5.68
10
8.08
5.35
20
7.77
5.15
40
7.44
4.92
2.36
2.16
3
9.61
4.45
5
9.10
4.21
10
8.93
4.13
40
8.21
3.80
2.83
2.59
3
10.12
3.91
5
9.74
3.76
10
9.48
3.65
20
9.10
3.52
Table IV
Random and drift velocities.
E/P0
Random velocity in cm/sec
Drift velocity in cm/sec
Drift/random velocities
3.5
1.2×108
2.1×106
0.017
11
1.4×108
6×106
0.043
Table V
Relative population variation with pressure based on equilibrium at calculated electron temperature.
Pressure in mm Hg
Electron temperature in deg C
ΔN/N for ΔE of 2×104 cm−1
0.842
60 000
0.479
1.65
45 000
0.639
2.36
39 000
0.737
2.83
36 500
0.787
Table VI
Calibration random uncertainty due to fluctuations in detection system and interpolation of wavelength scale.
Wavelength A
Error±%
Wavelength A
Error±%
7281
1.5
4143
1.0
7065
1.0
3964
1.0
6678
0.5
3937
1.0
5875
0.5
3926
1.0
5047
1.0
3888
0.5
5015
0.5
3819
1.0
4921
1.0
3652
1.0
4713
1.5
3634
1.0
4471
1.0
3613
1.0
4437
1.0
3447
1.5
4387
1.0
3188
2.0
4169
1.0
Table VII
Uncertainty in discharge tube current at various currents.