Inorganic Chemical Dynamics Group, Steacie Institute for Molecular Sciences, National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario K1A 0R6, Canada
*1991–1994 National Research Council of Canada Women in Science and Engineering student. Currently a graduate student in the department of physics of Dalhousie University, Halifax, Nova Scotia, Canada.
Margot D. Campbell-Miller and Benoit Simard, "First ionization potentials of tungsten and rhenium by mass-selected double-resonance ionization spectroscopy," J. Opt. Soc. Am. B 13, 2115-2120 (1996)
We have determined the first ionization potentials of tungsten and rhenium atoms to be 63427.7 ± 0.8 cm−1 (7.86404 ± 0.00010 eV) (2σ error bound) and 63181.6 ± 0.9 cm−1 (7.83352 ± 0.00011 eV), respectively, by fitting ns and nd Rydberg series obtained by performing mass-selected double-resonance ionization spectroscopy on supersonic beams of laser-vaporized tungsten and rhenium atoms.
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Cutoff of delayed ionization and the onset of prompt ionization.
Nonlinear least-squares fit of the high-lying Rydberg series.
For W, the fit of two Rydberg levels corrected by −2.8%. For Re, the fit of two triplet terms.
Appearance potentials by electron impact corrected for excited metastable states in the neutral atoms.
Tables (4)
Table 1
Results of Nonlinear Least-Squares Fits of Rydberg Series for Tungsten and Rheniuma
Atom
Type of Series
Range of n Fitted
Quantum Defect
rms of Fit (cm−1)
W
s
41–50
63 427.73(15)
4.673(54)
0.068
W
d
31–53
63 427.72 (7)
2.983(15)
0.056
Re
s
30–47
63 181.6 (2)
4.50 (3)
0.12
Re
d
29–46
63 181.7 (2)
2.96 (3)
0.13
The numbers in parentheses are the uncertainties (3σ) in units of the last quoted decimal place.
Table 2
Wave Numbers of the Rydberg Lines Observed for WI from the 5d46s(a6D)6p z5F10 Level
s Series
d Series
n Value
Wave Number (cm−1)
n Value
Wave Number (cm−1)
n Value
Wave Number (cm−1)
41
63 344.5
31
63 288.0
40
63 346.7
42
63 349.1
32
63 297.4
41
63 351.1
43
63 353.0
33
63 306.0
42
63 354.8
44
63 356.8
34
63 313.6
43
63 358.4
45
63 360.3
36
63 327.0
44
63 361.6
46
63 363.4
38
63 338.2
45
63 364.7
47
63 366.4
39
63 343.1
46
63 367.6
48
63 369.2
40
63 347.7
47
63 370.2
49
63 371.8
41
63 351.7
48
63 372.8
50
63 374.5
42
63 355.6
49
63 375.0
43
63 359.2
50
63 377.0
44
63 362.4
51
63 379.3
45
63 365.6
46
63 368.4
47
63 371.1
48
63 373.5
49
63 375.9
50
63 378.2
51
63 380.2
52
63 382.1
53
63 383.9
Table 3
Wave Numbers of the Rydberg Lines Observed for Re I from the 5d56s(a7S)6p z6P7/20 Level
s Series
d Series
n Value
Wave Number (cm−1)
n Value
Wave Number (cm−1)
30
63 012.7
29
63 020.0
31
63 025.3
30
63 031.5
32
63 036.7
31
63 041.9
33
63 046.4
32
63 051.5
34
63 055.5
33
63 060.1
35
63 063.7
34
63 067.9
36
63 071.1
35
63 074.7
37
63 077.7
36
63 081.3
38
63 083.9
37
63 087.1
39
63 089.3
38
63 092.5
40
63 094.7
39
63 097.4
41
63 099.1
40
63 101.7
42
63 103.5
41
63 105.8
43
63 107.5
42
63 109.7
44
63 111.3
43
63 113.1
45
63 114.7
44
63 116.5
46
63 117.7
45
63 119.3
47
63 121.1
46
63 122.5
Table 4
Derived First Ionization Potentials of Tungsten and Rhenium
Cutoff of delayed ionization and the onset of prompt ionization.
Nonlinear least-squares fit of the high-lying Rydberg series.
For W, the fit of two Rydberg levels corrected by −2.8%. For Re, the fit of two triplet terms.
Appearance potentials by electron impact corrected for excited metastable states in the neutral atoms.