.. SPDX-FileCopyrightText: 1992-2026 NWO-I/SRON Space Research Organisation Netherlands .. .. SPDX-License-Identifier: CC-BY-4.0 .. _sect:spex2notation: SPEX 2 notation of atomic transitions ===================================== On this page, we provide reference tables for the Mewe notation of atomic transitions used in SPEX version 2. For each atomic sequence, we provide the Mewe notation and the associated lower and upper levels with terms. .. Note:: This table contains Mg-like to K-like sequences, for Na-like and below, please refer to the SPEXACT version 3 line list. Mg sequence ----------- ========== ============ ===== ============ ==== Notation Lower level Term Upper level Term ========== ============ ===== ============ ==== Mg1 2p6 3s2 1S0 3s 4p 1P1 Mg2A 3s 3p 3P2 3s 4d 3D3 Mg2B 3s 3p 3P1 3s 4d 3D2 Mg3 3s 3p 1P1 3s 4d 1D2 Mg4A 3s 3p 3P0 3s 4s 3S1 Mg4B 3s 3p 3P1 3s 4s 3S1 Mg4C 3s 3p 3P2 3s 4s 3S1 Mg5 3p 3d 1P1 3p 4f 1D2 Mg6A 3s 3d 3D3 3s 4f 3F4 Mg6B 3s 3d 3D2 3s 4f 3F3 Mg6C 3s 3d 3D1 3s 4f 3F2 Mg7A 3s 3p 3P2 3s 3d 3D3 Mg7B 3s 3p 3P1 3s 3d 3D2 Mg7C 3s 3p 3P0 3s 3d 3D1 Mg7D 3s 3p 3P1 3s 3d 3D1 Mg7E 3s 3p 3P2 3s 3d 3D2 Mg8 3s 3p 1P1 3s 3d 1D2 Mg9 2p6 3s2 1S0 3s 3p 1P1 Mg10A 3s 3p 3P2 3p2 3P2 Mg10B 3s 3p 3P1 3p2 3P2 Mg11 2p6 3s2 1S0 3s 3p 3P1 Mg12A 3s 3p 3P2 3p2 1D2 Mg12B 3s 3p 3P1 3p2 1D2 Mg13 3s 3p 1P1 3p2 1D2 Mg14 3s 3p 1P1 3p2 1S0 Mg15 3s 3p 3P1 3s 3d 1D2 Mg16 3s 3p 1P1 3s 4s 1S0 Mg17 3p2 1D2 3s 4f 1F3 ========== ============ ===== ============ ==== Al sequence ----------- ========== ============ ===== ============ ===== Notation Lower level Term Upper level Term ========== ============ ===== ============ ===== Al1A 3s2 3p 2P1/2 3s 3p2 2P3/2 Al1B 3s2 3p 2P1/2 3s 3p2 2P1/2 Al1C 3s2 3p 2P3/2 3s 3p2 2P3/2 Al1D 3s2 3p 2P3/2 3s 3p2 2P1/2 Al1E 3s2 3p 2P1/2 3s 3p2 2S1/2 Al1F 3s2 3p 2P3/2 3s 3p2 2S1/2 Al20 3s 3p2 4P3/2 3s 3p 3d 4P5/2 Al21 3s 3p2 2D3/2 3s 3p 3d 2D3/2 Al22 3s 3p2 2D5/2 3s 3p 3d 2D5/2 Al23A 3s 3p2 2D3/2 3s 3p 3d 2F5/2 Al23B 3s 3p2 2D5/2 3s 3p 3d 2F5/2 Al24 3s 3p2 2D5/2 3s 3p 3d 2F7/2 Al25 3s 3p2 2S1/2 3s 3p 3d 2P3/2 Al26 3s 3p2 2P1/2 3s 3p 3d 2D3/2 Al27 3s 3p2 2P3/2 3s 3p 3d 2D5/2 Al4A 3s2 3p 2P3/2 3s2 3d 2D5/2 Al4B 3s2 3p 2P1/2 3s2 3d 2D3/2 Al4C 3s2 3p 2P3/2 3s2 3d 2D3/2 Al6A 3s2 3d 2D5/2 3s2 4p 2P3/2 Al6B 3s2 3d 2D3/2 3s2 4p 2P1/2 Al8A 3s2 3d 2D3/2 3s2 4f 2F5/2 Al8B 3s2 3d 2D5/2 3s2 4f 2F7/2 Al9A 3s2 3p 2P1/2 3s2 4s 2S1/2 Al9B 3s2 3p 2P3/2 3s2 4s 2S1/2 Al12A 3s2 3p 2P3/2 3s2 4d 2D5/2 Al12B 3s2 3p 2P1/2 3s2 4d 2D3/2 Al15A 3s2 3p 2P1/2 3s 3p2 2D3/2 Al15B 3s2 3p 2P3/2 3s 3p2 2D5/2 Al15C 3s2 3p 2P3/2 3s 3p2 2D3/2 Al16 3s2 3p 2P3/2 3s 3p2 4P5/2 Al17A 3s2 3p 2P1/2 3s 3p2 4P1/2 Al17B 3s2 3p 2P3/2 3s 3p2 4P1/2 Al17C Al17D 3s2 3p 2P3/2 3s 3p2 4P3/2 Al18A 3s 3p2 2D3/2 3p3 2D3/2 Al18B Al18C 3s 3p2 2D5/2 3p3 2D5/2 Al19 3s 3p2 2D5/2 3p3 2P3/2 ========== ============ ===== ============ ===== Si sequence ----------- ========== ============ ===== ============ ===== Notation Lower level Term Upper level Term ========== ============ ===== ============ ===== Si1A s2 3p2 3P1 3s 3p3 3S1 Si1B s2 3p2 3P2 3s 3p3 3S1 Si1C s2 3p2 3P0 3s 3p3 3S1 Si2A s2 3p2 3P1 3s2 3p 3d 1D2 Si2B s2 3p2 1D2 3s2 3p 3d 1D2 Si3A s2 3p2 3P0 3s2 3p 3d 3D1 Si3B s2 3p2 3P1 3s2 3p 3d 3D2 Si3C s2 3p2 3P2 3s2 3p 3d 3D3 Si3D s2 3p2 3P1 3s2 3p 3d 3D1 Si3E s2 3p2 3P2 3s2 3p 3d 3D1 Si3F s2 3p2 3P2 3s2 3p 3d 3D2 Si3G Si3H s2 3p2 1D2 3s2 3p 3d 3D2 Si4A s2 3p2 3P1 3s2 3p 3d 3P2 Si4B s2 3p2 3P2 3s2 3p 3d 3P2 Si4C Si4D s2 3p2 3P0 3s2 3p 3d 3P1 Si4E s2 3p2 3P2 3s2 3p 3d 3P1 Si4F s2 3p2 3P1 3s2 3p 3d 3P0 Si5A s2 3p2 3P2 3s2 3p 3d 1F3 Si5B s2 3p2 1D2 3s2 3p 3d 1F3 Si6 s2 3p2 1S0 3s2 3p 3d 1P1 Si7A s2 3p2 3P2 3s2 3p 4s 3P2 Si7B s2 3p2 3P2 3s2 3p 4s 3P1 Si7C s2 3p2 1D2 3s2 3p 4s 1P1 Si7D s2 3p2 3P1 3s2 3p 4s 3P2 Si8A s2 3p2 3P0 3s2 3p 4d 3D1 Si8B s2 3p2 3P1 3s2 3p 4d 3D2 Si8C s2 3p2 3P1 3s2 3p 4d 3P0 Si9A Si9B Si9C Si9D Si10A 3s2 3p2 3P1 3s 3p3 1P1 Si10B 3s2 3p2 1D2 3s 3p3 1P1 Si10C Si11A 3s2 3p2 3P0 3s 3p3 3D1 Si11B 3s2 3p2 3P1 3s 3p3 3D1 Si11C 3s2 3p2 3P1 3s 3p3 3D2 Si12A Si12B 3s2 3p2 3P0 3s 3p3 3P1 Si12C 3s2 3p2 3P1 3s 3p3 3P1 Si12D 3s2 3p2 3P2 3s 3p3 3P1 Si12E 3s2 3p2 3P1 3s 3p3 3P2 Si12F 3s2 3p2 3P2 3s 3p3 3P2 Si13 3s2 3p2 1D2 3s 3p3 1D2 Si14A 3s2 3p2 3P1 3s 3p3 5S2 Si14B 3s2 3p2 3P2 3s 3p3 5S2 Si15 3s2 3p2 3P1 3s2 3p2 1S0 ========== ============ ===== ============ ===== P sequence ---------- ============ ============ ===== ============ ===== Notation Lower level Term Upper level Term ============ ============ ===== ============ ===== P1A 3s2 3p3 2D5/2 3s2 3p2 4d 2P3/2 P1B P1C P1D P1E P1F 3s2 3p3 4S3/2 3s2 3p2 4d 4F5/2 P2A 3s2 3p3 4S3/2 3s2 3p2 4s 4P5/2 P2B 3s2 3p3 4S3/2 3s2 3p2 4s 4P3/2 P2C 3s2 3p3 4S3/2 3s2 3p2 4s 4P1/2 P3A 3s2 3p3 2D3/2 3s2 3p2 4s 2P3/2 P3B 3s2 3p3 2D5/2 3s2 3p2 4s 2P3/2 P3C P3D P3E 3s2 3p3 2D3/2 3s2 3p2 4s 2P1/2 P3F 3s2 3p2 3d 4F7/2 3s2 3p2 4f 4G9/2 P4B(80.160A) 3s2 3p3 2D3/2 3s2 3p2 4s 2D3/2 P4B(82.744A) 3s2 3p3 2P3/2 3s2 3p2 4s 2D3/2 P4C P4D 3s2 3p3 2D5/2 3s2 3p2 4s 2D5/2 P4E 3s2 3p3 2P3/2 3s2 3p2 4s 2D5/2 P5A 3s2 3p3 2P1/2 3s2 3p2 3d 2D3/2 P5B 3s2 3p3 2P3/2 3s2 3p2 3d 2D3/2 P6A 3s2 3p3 2D5/2 3s2 3p2 3d 2F7/2 P6B 3s2 3p3 2D3/2 3s2 3p2 3d 2F5/2 P6C 3s2 3p3 2D5/2 3s2 3p2 3d 2F5/2 P7 3s2 3p3 2P3/2 3s2 3p2 3d 2S1/2 P8A 3s2 3p3 2P1/2 3s2 3p2 3d 2P3/2 P8B 3s2 3p3 2P3/2 3s2 3p2 3d 2P3/2 P8C 3s2 3p3 2D3/2 3s2 3p2 3d 2P1/2 P8D 3s2 3p3 2P1/2 3s2 3p2 3d 2P1/2 P9A P9B 3s2 3p3 2D5/2 3s2 3p2 3d 2D5/2 P9C 3s2 3p3 2P3/2 3s2 3p2 3d 2D5/2 P9D 3s2 3p3 4S3/2 3s2 3p2 3d 2D3/2 P9E 3s2 3p3 2D3/2 3s2 3p2 3d 2D3/2 P9F 3s2 3p3 2D5/2 3s2 3p2 3d 2D3/2 P10A 3s2 3p3 2D5/2 3s2 3p2 3d 2D5/2 P10B 3s2 3p3 2P3/2 3s2 3p2 3d 2D5/2 P10C 3s2 3p3 2D3/2 3s2 3p2 3d 2D3/2 P11A 3s2 3p3 4S3/2 3s2 3p2 3d 4P1/2 P11B 3s2 3p3 2D3/2 3s2 3p2 3d 4P1/2 P11C 3s2 3p3 4S3/2 3s2 3p2 3d 4P3/2 P11D 3s2 3p3 4S3/2 3s2 3p2 3d 4P5/2 P12A 3s2 3p3 2D3/2 3s 3p4 2P1/2 P12B P12C 3s2 3p3 2P3/2 3s 3p4 2P1/2 P12D 3s2 3p3 2D3/2 3s2 3p2 3d 2P3/2 P12E 3s2 3p3 2D5/2 3s2 3p2 3d 2P3/2 P12F P12G P13A P13B P14A 3s2 3p3 2D3/2 3s 3p4 2S1/2 P14B P14C P14D 3s2 3p3 2D5/2 3s 3p4 2P3/2 P14E P14F P15A 3s2 3p3 2D5/2 3s 3p4 2D5/2 P15B 3s2 3p3 2P3/2 3s 3p4 2D5/2 P15C 3s2 3p3 2D3/2 3s 3p4 2D3/2 P15D 3s2 3p3 2P1/2 3s 3p4 2D3/2 P16A 3s2 3p3 4S3/2 3s 3p4 4P1/2 P16B 3s2 3p3 4S3/2 3s 3p4 4P3/2 P16C 3s2 3p3 4S3/2 3s 3p4 4P5/2 P17A 3s2 3p3 4S3/2 3s2 3p3 2P3/2 P17B 3s2 3p3 4S3/2 3s2 3p3 2P1/2 ============ ============ ===== ============ ===== S sequence ---------- ============ ============ ===== ============ ===== Notation Lower level Term Upper level Term ============ ============ ===== ============ ===== S1A 3s2 3p4 3P2 3s2 3p3 4d 3D3 S1B S1C 3s2 3p4 1D2 3s2 3p3 4d 1F3 S1D 3s2 3p4 1D2 3s2 3p3 4d 1D2 S2A 3s2 3p4 3P2 3s2 3p3 4s 3D3 S2B 3s2 3p4 3P2 3s2 3p3 4s 3D2 S2C 3s2 3p4 3P1 3s2 3p3 4s 3D2 S2D 3s2 3p4 3P1 3s2 3p3 4s 3D1 S2E 3s2 3p4 3P0 3s2 3p3 4s 3D1 S2F 3s2 3p4 1D2 3s2 3p3 4s 1P1 S2G S3A 3s2 3p4 3P2 3s2 3p3 4s 3S1 S3B 3s2 3p4 1D2 3s2 3p3 4s 1D2 S3C 3s2 3p4 3P1 3s2 3p3 4s 3S1 S3D 3s2 3p4 3P0 3s2 3p3 4s 3S1 S4A 3s2 3p4 3P2 3s2 3p3 3d 1P1 S4B 3s2 3p4 3P1 3s2 3p3 3d 1P1 S4C 3s2 3p4 3P0 3s2 3p3 3d 1P1 S4D 3s2 3p4 1D2 3s2 3p3 3d 1P1 S4E S4F 3s2 3p4 3P2 3s2 3p3 3d 3P2 S4G S5A 3s2 3p4 3P2 3s2 3p3 3d 3P2 S5B 3s2 3p4 3P1 3s2 3p3 3d 3P2 S5C S5D 3s2 3p4 3P1 3s2 3p3 3d 3P1 S5E 3s2 3p4 3P0 3s2 3p3 3d 3P1 S5F 3s2 3p4 1D2 3s2 3p3 3d 3P1 S5G 3s2 3p4 3P1 3s2 3p3 3d 3P0 S5H 3s2 3p4 3P2 3s2 3p3 3d 3S1 S5I S5J S6A 3s2 3p4 3P2 3s2 3p3 3d 3D3 S6B 3s2 3p4 3P2 3s2 3p3 3d 3D2 S6C 3s2 3p4 3P1 3s2 3p3 3d 3D2 S6D 3s2 3p4 3P1 3s2 3p3 3d 3D1 S6E 3s2 3p4 3P0 3s2 3p3 3d 3D1 S7A 3s2 3p4 3P1 3s2 3p3 3d 1D2 S7B 3s2 3p4 1D2 3s2 3p3 3d 1D2 S7C 3s2 3p4 1D2 3s2 3p3 3d 1F3 S8 3s2 3p4 1S0 3s2 3p3 3d 1P1 S9A 3s2 3p4 3P2 3s 3p5 1P1 S9B 3s2 3p4 1D2 3s 3p5 1P1 S9C 3s2 3p4 1S0 3s 3p5 1P1 S10 3s2 3p4 3P1 3s 3p5 3P0 S11A 3s2 3p4 3P2 3s 3p5 3P1 S11B 3s2 3p4 3P1 3s 3p5 3P1 S11C 3s2 3p4 3P0 3s 3p5 3P1 S12A 3s2 3p4 3P2 3s 3p5 3P2 S12B 3s2 3p4 3P1 3s 3p5 3P2 S13A 3s2 3p4 3P1 3s2 3p4 1S0 S13B 3s2 3p4 3P2 3s2 3p4 1S0 ============ ============ ===== ============ ===== Cl sequence ----------- ============ ============ ===== ============ ===== Notation Lower level Term Upper level Term ============ ============ ===== ============ ===== CL1A 3s2 3p5 2P3/2 3s2 3p4 4d 2P3/2 CL1B 3s2 3p5 2P1/2 3s2 3p4 4d 2P3/2 CL1C 3s2 3p5 2P3/2 3s2 3p4 4d 2D5/2 CL1D 3s2 3p5 2P3/2 3s2 3p4 4d 2D5/2 CL1E 3s2 3p5 2P3/2 3s2 3p4 4d 2D3/2 CL1F 3s2 3p5 2P1/2 3s2 3p4 4d 2D3/2 CL2A 3s2 3p5 2P3/2 3s2 3p4 4s 2D5/2 CL2B 3s2 3p5 2P1/2 3s2 3p4 4s 2D3/2 CL2C 3s2 3p5 2P3/2 3s2 3p4 4s 2P3/2 CL2D 3s2 3p5 2P1/2 3s2 3p4 4s 2P3/2 CL2E 3s2 3p5 2P3/2 3s2 3p4 4s 2P1/2 CL2F 3s2 3p5 2P1/2 3s2 3p4 4s 2P1/2 CL3A 3s2 3p5 2P3/2 3s2 3p4 4s 4P3/2 CL3B 3s2 3p5 2P3/2 3s2 3p4 4s 4P5/2 CL3C 3s2 3p5 2P1/2 3s2 3p4 4s 4P3/2 CL4A 3s2 3p5 2P3/2 3s2 3p4 3d 2D5/2 CL4B 3s2 3p5 2P3/2 3s2 3p4 3d 2D3/2 CL4C 3s2 3p5 2P1/2 3s2 3p4 3d 2D3/2 CL5A 3s2 3p5 2P3/2 3s2 3p4 3d 2P3/2 CL5B 3s2 3p5 2P3/2 3s2 3p4 3d 2P1/2 CL5C 3s2 3p5 2P1/2 3s2 3p4 3d 2P3/2 CL5D 3s2 3p5 2P1/2 3s2 3p4 3d 2P1/2 CL6A 3s2 3p5 2P3/2 3s2 3p4 3d 2S1/2 CL6B 3s2 3p5 2P1/2 3s2 3p4 3d 2S1/2 CL7A 3s2 3p5 2P3/2 3s2 3p4 3d 2D5/2 CL7B 3s2 3p5 2P3/2 3s2 3p4 3d 2D3/2 CL7C 3s2 3p5 2P1/2 3s2 3p4 3d 2D3/2 CL8A 3s2 3p5 2P3/2 3s2 3p4 3d 2F5/2 CL8B 3s2 3p5 2P3/2 3s2 3p4 3d 2F5/2 CL9A 3s2 3p4 3d 4D5/2 3s2 3p4 3d 2F7/2 CL9B 3s2 3p4 3d 4F9/2 3s2 3p4 3d 2F7/2 CL10A 3s2 3p4 3d 4D5/2 3s2 3p4 3d 2G9/2 CL10B 3s2 3p4 3d 4D5/2 3s2 3p4 3d 2F7/2 CL11 3s2 3p5 2P3/2 3s2 3p4 3d 2D5/2 CL12A 3s2 3p5 2P1/2 3s2 3p4 3d 2G9/2 CL12B CL12C CL13A 3s2 3p5 2P3/2 3s2 3p4 3d 2P3/2 CL13B CL13C 3s2 3p5 2P1/2 3s2 3p4 3d 2G9/2 CL13D CL14 3s2 3p4 3d 4D5/2 3s2 3p4 3d 2G7/2 CL15 3s2 3p5 2P3/2 3s2 3p4 3d 4F5/2 CL16 3s2 3p5 2P3/2 3s2 3p4 3d 4D3/2 CL17 3s2 3p5 2P3/2 3s2 3p4 3d 4D7/2 CL18A 3s2 3p5 2P3/2 3s 3p6 2S1/2 CL18B 3s2 3p5 2P1/2 3s 3p6 2S1/2 ============ ============ ===== ============ ===== Ar sequence ----------- ============ ============ ===== ============ ===== Notation Lower level Term Upper level Term ============ ============ ===== ============ ===== A1A 3p6 1S0 3p5 4d 3D1 A1B 3p6 1S0 3p5 4d 1P1 A2 3p6 1S0 3p5 4s 1P1 A3 3p6 1S0 3p5 4s 3P1 A4 3p6 1S0 3p5 3d 1P1 A5A 3p5 3d 3P1 3p5 3d 1F3 A5B 3p5 3d 3P2 3p5 3d 1F3 A6A 3p5 3d 3P1 3p5 3d 3D2 A6B 3p6 1S0 3p5 3d 3D2 A7 3p6 1S0 3p5 3d 3D1 A8A 3p6 1S0 3p5 3d 1D2 A8B 3p5 3d 3P0 3p5 3d 1D2 A9 3p6 1S0 3p5 3d 3F2 A10 3p6 1S0 3p5 3d 3P2 A11 3p6 1S0 3p5 3d 3P1 ============ ============ ===== ============ ===== K sequence ---------- ============ ============ ===== ============ ===== Notation Lower level Term Upper level Term ============ ============ ===== ============ ===== K1A 3p6 3d 2D3/2 3p6 7f 2F5/2 K1B K1C 3p6 3d 2D5/2 3p6 7f 2F7/2 K2A 3p6 3d 2D3/2 3p6 6f 2F5/2 K2B 3p6 3d 2D5/2 3p6 6f 2F7/2 K2C 3p6 3d 2D5/2 3p6 6f 2F7/2 K3A 3p6 3d 2D3/2 3p6 5f 2F5/2 K3B K3C 3p6 3d 2D5/2 3p6 5f 2F7/2 K4A 3p6 3d 2D5/2 3p6 4f 2F7/2 K4B 3p6 3d 2D3/2 3p6 4f 2F5/2 K4C 3p6 3d 2D5/2 3p6 4f 2F5/2 K5A 3p6 3d 2D5/2 3p5 3d2 2D5/2 K5B 3p6 3d 2D3/2 3p5 3d2 2D3/2 K5C 3p6 3d 2D5/2 3p5 3d2 2D3/2 K5D 3p6 3d 2D3/2 3p5 3d2 2D5/2 K6A 3p6 3d 2D5/2 3p5 3d2 2P3/2 K6B 3p6 3d 2D3/2 3p5 3d2 2P1/2 K6C 3p6 3d 2D3/2 3p5 3d2 2P3/2 K7A 3p6 3d 2D5/2 3p5 3d2 2F7/2 K7B 3p6 3d 2D3/2 3p5 3d2 2F5/2 K7C 3p6 3d 2D5/2 3p5 3d2 2F5/2 K8A 3p6 3d 2D3/2 3p6 4p 2P1/2 K8B 3p6 3d 2D3/2 3p6 4p 2P3/2 K8C 3p6 3d 2D5/2 3p6 4p 2P3/2 K9A 3p6 3d 2D3/2 3p5 3d 4s 2D3/2 K9B 3p6 3d 2D5/2 3p5 3d 4s 2D5/2 K10 3p6 3d 2D5/2 3p5 3d 4s 2F7/2 K11A K11B 3p6 3d 2D5/2 3p5 3d 4s 2F7/2 K12A 3p6 3d 2D5/2 3p5 3d 4s 2P3/2 K12B 3p6 3d 2D3/2 3p5 3d 4s 2P1/2 K13A K13B K14A K14B ============ ============ ===== ============ =====