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Table 1.

Transitions and isotopic shifts Δλ := λ(3He) − λ(4He) of selected He I lines in the near-ultraviolet, optical, and near-infrared spectral range up to principal quantum number n = 8.

Transition λ (4He) [Å] λ (3He) [Å] Δλ [Å]
1s 2s 3S1–1s 3p 3888.649 3888.862 0.213
1s 2s 3S1–1s 4p 3187.745 3187.903 0.158
1s 2s 3S1–1s 5p 2945.104 2945.246 0.142
1s 2s 3S1–1s 6p 2829.081 2829.216 0.135
1s 2s 3S1–1s 7p 2763.803 2763.934 0.131
1s 2s 3S1–1s 8p 2723.192 2723.320 0.128
1s 2s 1S0–1s 3p 5015.678 5015.890 0.212
1s 2s 1S0–1s 4p 3964.729 3964.912 0.183
1s 2s 1S0–1s 5p 3613.642 3613.812 0.170
1s 2s 1S0–1s 6p 3447.589 3447.753 0.164
1s 2s 1S0–1s 7p 3354.555 3354.715 0.160
1s 2s 1S0–1s 8p 3296.773 3296.930 0.157
1s 2p –1s 3s 1S0 7281.351 7281.904 0.553
1s 2p –1s 3d 1D2 6678.152 6678.654 0.502
1s 2p –1s 4s 1S0 5047.739 5048.078 0.339
1s 2p –1s 4d 1D2 4921.931 4922.262 0.331
1s 2p –1s 5s 1S0 4437.553 4437.841 0.288
1s 2p –1s 5d1D2 4387.929 4388.213 0.284
1s 2p –1s 6s 1S0 4168.971 4169.237 0.266
1s 2p –1s 6d 1D2 4143.759 4144.023 0.264
1s 2p –1s 7s 1S0 4023.980 4024.233 0.253
1s 2p –1s 7d 1D2 4009.257 4009.509 0.252
1s 2p –1s 8s 1S0 3935.945 3936.192 0.247
1s 2p –1s 8d 1D2 3926.544 3926.790 0.246
1s 2p –1s 3s 3S1 7065.215 7065.205 -0.010
1s 2p –1s 3d 3D1 5875.625 5875.669 0.044
1s 2p –1s 4s 3S1 4713.139 4713.208 0.069
1s 2p –1s 4d 3D1 4471.470 4471.544 0.074
1s 2p –1s 5s 3S1 4120.811 4120.887 0.076
1s 2p –1s 5d 3D1 4026.184 4026.262 0.078
1s 2p –1s 6s 3S1 3867.472 3867.550 0.078
1s 2p –1s 6d 3D1 3819.602 3819.680 0.078
1s 2p –1s 7s 3S1 3732.863 3732.942 0.079
1s 2p –1s 7d 3D1 3704.995 3705.074 0.079
1s 2p –1s 8s 3S1 3651.982 3652.060 0.078
1s 2p –1s 8d 3D1 3634.231 3634.310 0.079

Notes. The listed transitions are implemented in NLTE in the 3He and 4He model atoms used for this study (see Sect. 3.1 for details). All wavelengths for the 4He and 3He components of the listed He I lines were extracted from the Atomic Spectra Database of NIST (https://physics.nist.gov/PhysRefData/ASD/lines_form.html). For each individual line, only one of the transitions with the highest relative intensity according to NIST is listed.

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