# belike_jl95#c2.dat

## Resolved Specific Ion Data Collections

Ion
C2+
Temperature Range
0.776 eV → 155 eV

Filename
belike_jl95#c2.dat
Full Path
• Spontaneous Emission: C+2(i) → C+2(j) + hv
• Electron Impact Excitation: C+2(i) + e → C+2(j) + e
 2s2(1s0) 1S0.0 0.0 cm-1 2s2p(3p0) 3P0.0 52367.1 cm-1 2s2p(3p1) 3P1.0 52390.8 cm-1 2s2p(3p2) 3P2.0 52447.1 cm-1 2s2p(1p1) 1P1.0 102352.0 cm-1 2p2(3p0) 3P0.0 137426.0 cm-1 2p2(3p1) 3P1.0 137454.0 cm-1 2p2(3p2) 3P2.0 137502.0 cm-1 2p2(1d2) 1D2.0 145876.0 cm-1 2p2(1s0) 1S0.0 182520.0 cm-1 2s3s(3s1) 3S1.0 238213.0 cm-1 2s3s(1s0) 1S0.0 247170.0 cm-1 2s3p(1p1) 1P1.0 258931.0 cm-1 2s3p(3p0) 3P0.0 259706.0 cm-1 2s3p(3p1) 3P1.0 259711.0 cm-1 2s3p(3p2) 3P2.0 259724.0 cm-1 2s3d(3d1) 3D1.0 270011.0 cm-1 2s3d(3d2) 3D2.0 270012.0 cm-1 2s3d(3d3) 3D3.0 270015.0 cm-1 2s3d(1d2) 1D2.0 276483.0 cm-1
 + 2         6         3        386241.
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Energy Levels
The results from NSRDS NBS3 SECT 3 were used. These were the same
as the results of Edlen (Phys. Scr 32, 86, 1985 and  28, 51, 1983)
who only considered n=2 levels. The NSRDS values are also those of
Moore and Gallacher "Tables of Spectra of hydrogen, carbon, nitrogen
and oxygen atoms and ions" CRC press 1993.

Ionisation Potential
As energy levels.

A Values
For transitions between n = 2 levels the results of the compilation
by Allard et al (Astron Astrophys Suppl Ser 84, 563, 1990) were used
and for values not given by them the results of Nussbaumer and Storey
(Astron Astrophys 74, 244, 1979) were used. The Nusssbaumer and Storey
results were adopted for forbidden transitions by Allard et al.
For the 2-3 and 3-4 transitions the results of Idrees and Das (J Phys B
22, 3609, 1989 were used.
For transitions involving n = 3 levels again the results of Allard et al
For the important 2s2 1S - 2s2p 3P1 transition Allard et al recommend a
value of 93.98 s-1.  Recently Kwong et al (Ap J 411, 431, 1993) have
published a measured value of 121 +/- 7 s-1. There have been two recent
calculation of this rate, Fleming et al (Phys. Scr 49, 316, 1994) giving
104 +/-4 s-1 and Fischer (Phys Scr 49, 323, 1994) giving 103 +/- 3 s-1.

Collision Data
The data recommended in a review by Berrington (ADNDT 57, 71, 1994) are
The results of Berrington (J Phys B, 18, L395, 1985) and Berrington et al
(J Phys B 22, 665, 1989 and JET Report JT7/11345) were adopted for
transitions between n=2 levels and for transitions involving levels 3
respectively. These results were obtained from a 12 eigenstate R-matrix
calculation. The 12 states correspond to the 20 lowest fine structure
levels. For transitions betweeen n = 2 levels the partial wave expansion
was for total angular momentum L <= 9. For some transitions the partial
wave expansion is slowly convergent and care was taken to allow for this.
For transitions involving n=3 levels it appears that partial waves up to
L <= 11 ware included. However, the slow convergence of the partial
wave expansion was a problem which was dealt with by writing a new no-
exchange R-matrix package. In addition for dipole allowed transitions a
top-up procedure was adopted, care being taken that the Coulomb-Bethe
approximation was valid when it was applied.
These calculations gave effective collision strengths between LS terms.
Berrington (ADNDT 57, 71, 1994) in a review recommends the work of
Berrington et al (ADNDT 33, 195, 1985) for fine structure transitions
involving 2s2p 3P or 2p2 3P. These recommendations were adopted.
For the former Keenan et al (Ap J 389, 443, 1992) give the unpublished
rates from Berrington's 1985 calculation. However they are at most 7%
different (2-4, lowest temperature value) and the Keenan et al results
are only at three low close temperature.
To obtain the fine structure collision rates statistical weight factors
were used except for the transitions given in the tables below.

The tables give the percentages of the total collision strength going into
each of the fine structure transitions at a reduced temperature of 1e4.

2s2p 3Pj - 2p2 3Pj'

j j'   NIV     OV     OV   NeVII  NeVII  AQ        Use
(CC)   (CC)   (DW)   (CC)   (DW)
0 0    0.16   0.115  0.09   0.08   0.07            0.16
0 1   10.67  10.8   11.23  10.79  11.07  11.1     10.7
0 2    0.35   0.214  0.11   0.12   0.09            0.35

1 0   10.72  10.76  11.23  10.79  10.88  11.1     10.7
1 1    8.82   8.65   7.71   8.56   8.57   8.33     8.8
1 2   13.99  13.93  12.56  14.19  14.02  12.89    14.0

2 0    0.35   0.21   0.11   0.12   0.08            0.35
2 1   14.15  13.99  14.26  14.19  14.02  13.89    14.2
2 2   40.81  41.38  42.72  41.16  41.22  41.67    40.8

The values adopted are close to that of N IV. The N IV calculation is
by Ramsbottom et al (see adf04 file), the O V CC data are from Kato, Lang
and Berrington (see adf04 file). The DW calculations are Sampson (see
copsm#be). The Ne VII data are from ADF04 file (JL95).

2s2p 3Pj - 2s3d 3Dj'

j j'   NIV     OV     OV     AQ
(CC)   (CC)   (CC1)  NeVII
0 1    9.09   9.04   9.74  11.11
0 2    1.11   1.13   0.78
0 3    0.96   1.01   0.77

1 1    8.30   8.26   8.37   8.33
1 2   21.48  21.32  22.88  25.00
1 3    3.48   3.61   2.62

2 1    2.73   2.75   2.22   0.56
2 2   10.91  10.72  10.23   8.33
2 3   41.95  42.17  42.39  46.67

The values adopted are those of N IV. The N IV calculation is by
Ramsbottom et al (see adf04 file), the O V CC data are from Kato, Lang
and Berrington (see adf04 file) and CC1 is adf04 from 89 (or 90).

2s2p 3Pj - 2s3p 3Pj'

j j'   NIV     OV     OV    NeVII
(CC)   (CC)   (CC1)  (DW)
0 0    6.87   7.00   8.24   5.51
0 1    2.06   1.89   1.05   0.54
0 2    2.16   2.36   1.78   1.12

1 0    2.06   1.92   1.04   0.51
1 1   23.77  24.52  26.88  17.46
1 2    7.37   7.36   5.33  39.96

2 0    2.19   2.45   1.79   1.11
2 1    7.42   7.66   5.31   2.44
2 2   46.09  44.86  48.58  31.39

The values adopted are those of N IV. The N IV calculation is by
Ramsbottom et al (see adf04 file), the O V CC data are from Kato, Lang
and Berrington (see adf04 file) and CC1 is adf04 from 89 (or90). The DW
calculation for Ne VII is from Sampson et al (1984) from JL95.

2p2 3Pj - 2s3p 3Pj'

j j'   NIV     OV    NeVII  AQ
(CC)   (CC)   (DW)
0 0    0.86   0.14   0.24
0 1    6.75   0.84  10.19  11.1
0 2    3.23   0.77   0.72

1 0    6.76   0.85  10.11  11.11
1 1   10.00   1.76   8.87   8.33
1 2   15.64   3.08  14.67  12.89

2 0    3.22   0.72   0.68
2 1   17.23   2.80  13.92  13.89
2 2   36.31  89.04  40.61  41.67

The values adopted are those of N IV. The N IV calculation is by
Ramsbottom et al (see adf04 file), the O V CC data are from  Kato, Lang
and Berrington (see adf04 file). The DW calculation for Ne VII is from
Sampson et al (1984) from JL95.

2p2 3Pj - 2s3d 3Dj'

j j'   NIV     OV    NeVII
(CC)   (CC)   (DW)
0 1    2.73   3.61   2.94
0 2    5.98   4.33   6.36
0 3    2.28   3.09   2.02

1 1   10.19   8.49  10.80
1 2    9.87  12.32  10.00
1 3   12.89  12.32  12.74

2 1    7.69   7.79   7.18
2 2   17.27  16.50  17.46
2 3   31.11  31.56  30.51

The values adopted are essentially that of N V. The N IV calculation
is by Ramsbottom et al (see adf04 file), the O V CC data are from Kato,
Lang and Berrington (see adf04 file). The DW data for Ne VII are from
Sampson et al (1984) from JL95.

2s3p 3Pj - 2s3d 3Dj'

j j'    OV     AQ
(CC)
0 1    9.98  11.11
0 2    0.19
0 3    0.24

1 1    7.54   8.33
1 2   25.52  25.00
1 3    0.74

2 1    1.02   0.56
2 2    9.29   8.33
2 3   45.48  46.17

The values adopted are for O V. The O V CC data are from Kato, Lang

In processing the 2p2 3P - 2s3p 3P data, it was noted that this is given
as a forbidden transition. However, it has a fairly large A value.
So allowed behaviour was forced on it when running ADAS 102. At the
highest temperature given here this gives a 1% increase in the effective
collision strength between the LS terms.

J LANG    June 1995.

Update:  28/10/97  HP Summers - amended ion charge from 3 to 2.

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### Contributors

• Jim Lang
• Keith Berrington
• Douglas Sampson
• Hugh Summers
• Processes
• States