CHIANTI

An Atomic Database for Spectroscopic Diagnostics of Astrophysical Plasmas.


Ar XVIII - VERSION 11.0.1


Here you find various information on the brightest lines, ordered in wavelength:
Wavelengths (Angstroms); weighted oscillator strengths (gf); transition probabilities (A); intensities (normalised) at 106 , 1010, 1015, 1020 cm-3; together with:
Configuration; Term; Index of the level (1=ground); Energy (observed if available - otherwise theoretical); of the lower (l) and upper levels (u)
Note that intensities have been calculated at log T[K]=7.45, where the ion fraction peaks in ionization equilibrium. Only lines brighter than 0.001 the strongest line (at all densities) are retained.


Wavelength

gf

Aul

R

R

R

R

Cl

Tl

Cu

Tu

Il

Iu

El

Eu

(A)

(s-1)

(106)

(1010)

(1015)

(1020)

(cm-1)

(cm-1)

2.9175 1.84e-02 3.60e+12 2.15e-02 2.15e-02 2.15e-02 1.89e-02 1s 2S1/2 5p 2P3/2 1 20 0 34276000
2.9177 9.16e-03 3.59e+12 1.07e-02 1.07e-02 1.07e-02 9.41e-03 1s 2S1/2 5p 2P1/2 1 17 0 34273516
2.9873 3.84e-02 7.16e+12 4.78e-02 4.78e-02 4.77e-02 4.20e-02 1s 2S1/2 4p 2P3/2 1 13 0 33474750
2.9878 1.91e-02 7.13e+12 2.39e-02 2.39e-02 2.39e-02 2.10e-02 1s 2S1/2 4p 2P1/2 1 10 0 33469894
3.1502 1.04e-01 1.75e+13 1.46e-01 1.46e-01 1.45e-01 1.30e-01 1s 2S1/2 3p 2P3/2 1 8 0 31743728
3.1514 5.22e-02 1.75e+13 7.33e-02 7.33e-02 7.32e-02 6.52e-02 1s 2S1/2 3p 2P1/2 1 5 0 31732214
3.7310 5.47e-01 6.55e+13 1.00e+00 1.00e+00 1.00e+00 1.00e+00 1s 2S1/2 2p 2P3/2 1 4 0 26802466
3.7363 0.00e+00 9.08e+06 9.16e-03 9.16e-03 9.08e-03 9.80e-06 1s 2S1/2 2s 2S1/2 1 2 0 26764198
3.7370 2.76e-01 6.59e+13 5.16e-01 5.16e-01 5.16e-01 5.55e-01 1s 2S1/2 2p 2P1/2 1 3 0 26759432
14.8913 2.43e-01 1.83e+12 1.25e-03 1.25e-03 1.25e-03 1.12e-03 2p 2P1/2 4d 2D3/2 3 12 26759432 33474740
14.9019 1.35e-01 1.02e+12 1.36e-03 1.36e-03 1.36e-03 1.19e-03 2s 2S1/2 4p 2P3/2 2 13 26764198 33474750
14.9838 4.38e-01 2.17e+12 1.16e-03 1.16e-03 1.16e-03 1.07e-03 2p 2P3/2 4d 2D5/2 4 14 26802466 33476348
14.9979 1.27e-02 1.88e+11 1.43e-03 1.43e-03 1.43e-03 1.27e-03 2p 2P3/2 4s 2S1/2 4 11 26802466 33470058
20.0631 1.38e+00 5.70e+12 3.33e-03 3.33e-03 3.33e-03 3.23e-03 2p 2P1/2 3d 2D3/2 3 7 26759432 31743708
20.0822 5.68e-01 2.35e+12 3.06e-03 3.06e-03 3.06e-03 2.72e-03 2s 2S1/2 3p 2P3/2 2 8 26764198 31743728
20.1079 2.71e-02 2.23e+11 2.78e-03 2.78e-03 2.77e-03 2.51e-03 2p 2P1/2 3s 2S1/2 3 6 26759432 31732606
20.1288 2.90e-01 2.39e+12 1.56e-03 1.56e-03 1.56e-03 1.39e-03 2s 2S1/2 3p 2P1/2 2 5 26764198 31732214
20.2223 2.50e+00 6.78e+12 2.84e-03 2.84e-03 2.85e-03 3.05e-03 2p 2P3/2 3d 2D5/2 4 9 26802466 31747512
20.2834 5.73e-02 4.64e+11 5.71e-03 5.71e-03 5.71e-03 5.17e-03 2p 2P3/2 3s 2S1/2 4 6 26802466 31732606

Created by Giulio Del Zanna on Wed Apr 16 17:42:13 2025