The high resolution absorption spectrum of Pb i is reported between 1350 and 2041 Å. Transitions are observed from the 6p 2 (1/2,1/2)0, (3/2,1/2)1, and (3/2,1/2)2 levels to levels with J ≤ 2 associated with 6pns and 6pnd configurations. Energy levels have been determined with n* values as high as 74. More than 500 spectral features and 370 odd parity energy levels are reported, a major part of which are new. These observations include five electric quadrupole transitions and 31 nuclear-spin-induced transitions from the 207Pb isotope. Ionization limits of 59819.57 ± 0.10 cm−1 and 73900.64 ± 0.10 cm−1 have been determined for levels converging on the
and
levels of Pb ii, respectively. An analysis of these data in terms of Lu-Fano graphical methods and multichannel quantum defect parametrization also is presented.
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Comments in this column have the following meanings, q = questionable line; Q = electric quadrupole transition; N = nuclear-spin-induced transition; A1, A2, A3 = absorption maxima of Beutler-Fano profile while. E1, E2, E3 = absorption minima of Beutler-Fano profile (see Fig. 2).
Intensities are visual estimates (see text). A d indicates a diffuse line, an s a shoulder measurement, and an * a blend. The intensity scales for the emissionlike features (absorption minima) and the absorptionlike features are necessarily independent, and in the opposite sense.
The upper level of the transitions is defined by its J′ value and
effective quantum number (see Table II and text).
The combinations with the ground levels
and
observed in this work are indicated by intensity figures (from Table I) in the J″ = 0 and J″ =1 columns, respectively. The combinations observed by Wood and Andrew (Ref. 3) outside the wavelength range reported here are indicated by a “b” in the appropriate column.
Indicates data taken from Ref. 3.
Where possible, the levels have been given jj or jk labels. In the case of the J = 2 levels, the configuration mixing is serious enough to force the abandonment of this labeling for n > 11 (see Fig. 5). In the.J = 0 and J = 1 cases, this labeling has been extended to the series limits, however, the fact that levels can be arranged into “series” with nearly constant quantum defects should not be taken to mean that configuration mixing is absent in the J = 0 and J = 1 channels. The evidence for this mixing is the appearance of the Beutler-Fano profiles in the autoionized portion of the channel structure. It is fortuitous that the series limits in the J = 0 and J = 1 cases occur in a region where the quantum defects are not changing rapidly (see Fig. 3).
This “level” is actually the position of the first member of a series of autoionized features (marked E1 in Fig. 2) with
. Since the wave number of the combination with the J″ = 0 level and energy of the autoionized “level” coincide. the remainder of this series is found in Table I with
.
The first member of a series of features (marked E2 in Fig. 2) with
. The remainder of these features are reported in Table I with
.
The first member of a series of features (marked A3 in Fig. 2) with
. The remainder of this series with
are reported in Table I.
TABLE III
Transformation matrix Uiα and eigenquantum defects μα for the J = 2 odd parity levels of Pbi.a
i
α
1
2
3
4
1
0. 385 78
0. 883 93
0. 189 16
0. 184 58
2
0. 684 67
−0. 453 51
0. 538 32
0. 189 13
3
−0. 314 43
−0. 063 47
0. 013 70
0. 947 06
4
−0. 532 48
0. 094 74
0. 821 12
− 0. 182 32
μα
0. 665
0. 71
0. 78
0. 83
N = 60
σ = 0. 15
The matrix elements Uiα appear in the square brackets. The
channel contributions have been neglected in our parametric fitting because the channel is determined by a single data point (see dashed portion of Fig. 4). The remaining matrix elements belong to the channels associated with the d electron. The jK labels on the columns and the jj labels on the rows indicate the starting point of the iterative fitting procedure (see text). Since the initial Uiα elements were altered considerably, these row and column level labels do not reflect the properties of the α and i states. Included under the row of μα values are the range of
values considered, the actual number of energy levels used, and the standard deviation of
for the final fit.
Comments in this column have the following meanings, q = questionable line; Q = electric quadrupole transition; N = nuclear-spin-induced transition; A1, A2, A3 = absorption maxima of Beutler-Fano profile while. E1, E2, E3 = absorption minima of Beutler-Fano profile (see Fig. 2).
Intensities are visual estimates (see text). A d indicates a diffuse line, an s a shoulder measurement, and an * a blend. The intensity scales for the emissionlike features (absorption minima) and the absorptionlike features are necessarily independent, and in the opposite sense.
The upper level of the transitions is defined by its J′ value and
effective quantum number (see Table II and text).
The combinations with the ground levels
and
observed in this work are indicated by intensity figures (from Table I) in the J″ = 0 and J″ =1 columns, respectively. The combinations observed by Wood and Andrew (Ref. 3) outside the wavelength range reported here are indicated by a “b” in the appropriate column.
Indicates data taken from Ref. 3.
Where possible, the levels have been given jj or jk labels. In the case of the J = 2 levels, the configuration mixing is serious enough to force the abandonment of this labeling for n > 11 (see Fig. 5). In the.J = 0 and J = 1 cases, this labeling has been extended to the series limits, however, the fact that levels can be arranged into “series” with nearly constant quantum defects should not be taken to mean that configuration mixing is absent in the J = 0 and J = 1 channels. The evidence for this mixing is the appearance of the Beutler-Fano profiles in the autoionized portion of the channel structure. It is fortuitous that the series limits in the J = 0 and J = 1 cases occur in a region where the quantum defects are not changing rapidly (see Fig. 3).
This “level” is actually the position of the first member of a series of autoionized features (marked E1 in Fig. 2) with
. Since the wave number of the combination with the J″ = 0 level and energy of the autoionized “level” coincide. the remainder of this series is found in Table I with
.
The first member of a series of features (marked E2 in Fig. 2) with
. The remainder of these features are reported in Table I with
.
The first member of a series of features (marked A3 in Fig. 2) with
. The remainder of this series with
are reported in Table I.
TABLE III
Transformation matrix Uiα and eigenquantum defects μα for the J = 2 odd parity levels of Pbi.a
i
α
1
2
3
4
1
0. 385 78
0. 883 93
0. 189 16
0. 184 58
2
0. 684 67
−0. 453 51
0. 538 32
0. 189 13
3
−0. 314 43
−0. 063 47
0. 013 70
0. 947 06
4
−0. 532 48
0. 094 74
0. 821 12
− 0. 182 32
μα
0. 665
0. 71
0. 78
0. 83
N = 60
σ = 0. 15
The matrix elements Uiα appear in the square brackets. The
channel contributions have been neglected in our parametric fitting because the channel is determined by a single data point (see dashed portion of Fig. 4). The remaining matrix elements belong to the channels associated with the d electron. The jK labels on the columns and the jj labels on the rows indicate the starting point of the iterative fitting procedure (see text). Since the initial Uiα elements were altered considerably, these row and column level labels do not reflect the properties of the α and i states. Included under the row of μα values are the range of
values considered, the actual number of energy levels used, and the standard deviation of
for the final fit.
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