M1 is the *magnetic dipole transition* which occurs only between states of the same parity. E2 is the *electric quadrupole transition* which occurs only between states of the same parity. M2 is the *magnetic quadrupole transition* which occurs only between states of different parities. The oscillator strength is a dimensionless quantity which for strong lines (both in atoms and in ions) is of the order of unity. This level/line may not be real. This level was determined by interpolation or extrapolation of known experimental values; its absolute accuracy is reflected in the number of significant figures assigned to it. This level was determined by interpolation or extrapolation of known experimental values; its absolute accuracy is reflected in the number of significant figures assigned to it. Observed in absorption Line or feature having large width due to autoionization broadening Beam-foil measurement Intensity is shared by several lines Double line Broad due to overexposure in the quoted reference Line position estimated Very hazy line Superposed with neighbor line See the original reference on other issues Observed value given is actually the Ritz value rounded to 0.1 Å, e.g., Ne I The relative positions of the levels within such a system are accurate within experimental uncertainties, but no experimental connection between this system and the other levels of the spectrum has been made. This level may have substantial autoionization rate. Band head Blended with another line that may affect the wavelength and intensity Complex line Diffuse line Forbidden line Transition involving a level of the ground term Hazy line Line has hyperfine structure Identification uncertain Wavelength smoothed along isoelectronic sequence Shaded to longer wavelengths Masked by another line (no wavelength measurement) Term assignment of the level is questionable Perturbed by a close line Asymmetric line Easily reversed Shaded to shorter wavelengths Tentatively classified line. Unresolved from close line Wide line Extrapolated wavelength This wavelength is calculated on-line. The number of significant digits was obtained assuming the trailing zeros in the energies are insignificant, and thus the real accuracy may be higher. This wavelength is calculated on-line with a proper account of significant digits Unknown line type Somewhat less intensity than the value given A multiplet in the original compilation has been separated into its component lines and the transition probability was derived from the compiled value assuming spin-orbit coupling. This may decrease the listed accuracy, especially for weaker transitions. Relative intensities provide a *qualitative* description of what the emission spectrum of a particular element in a particular (low-density) source looks like. More help . [skip navigation] <#start> [ASD Home] [Lines Query] [Levels Query] [List of Spectra] [Ground States and Ionization Energies] [Bibliography] [Help] NIST Physics Laboratory NIST Atomic Spectra Database Levels Data *Example of how to reference these results:* Ralchenko, Yu., Kramida, A.E., Reader, J., and NIST ASD Team (2008). /NIST Atomic Spectra Database/ (version 3.1.5), [Online]. Available: http://physics.nist.gov/asd3 [2008, November 18]. National Institute of Standards and Technology, Gaithersburg, MD. Some data for neutral and singly-charged ions are available in the Handbook of Basic Atomic Spectroscopic Data Mg II 149 Levels Found ------------------------------------------------------------- Configuration | Term | J | Level | ------------------------|--------|------|-------------------| | | | | 2p6.3s | 2S | 1/2 | 0 | | | | | 2p6.3p | 2P* | 1/2 | 35669.31 | | | 3/2 | 35760.88 | | | | | 2p6.4s | 2S | 1/2 | 69804.95 | | | | | 2p6.3d | 2D | 5/2 | 71490.19 | | | 3/2 | 71491.06 | | | | | 2p6.4p | 2P* | 1/2 | 80619.50 | | | 3/2 | 80650.02 | | | | | 2p6.5s | 2S | 1/2 | 92790.51 | | | | | 2p6.4d | 2D | 5/2 | 93310.59 | | | 3/2 | 93311.11 | | | | | 2p6.4f | 2F* | 5/2 | 93799.63 | | | 7/2 | 93799.75 | | | | | 2p6.5p | 2P* | 1/2 | 97455.12 | | | 3/2 | 97468.92 | | | | | 2p6.6s | 2S | 1/2 | 103196.75 | | | | | 2p6.5d | 2D | 5/2 | 103419.70 | | | 3/2 | 103420.00 | | | | | 2p6.5f | 2F* | 5/2 | 103689.86 | | | 7/2 | 103689.92 | | | | | 2p6.5g | 2G | 9/2 | 103705.66 | | | 7/2 | 103705.66 | | | | | 2p6.6p | 2P* | 1/2 | 105622.34 | | | 3/2 | 105629.72 | | | | | 2p6.7s | 2S | 1/2 | 108784.33 | | | | | 2p6.6d | 2D | 5/2 | 108900.02 | | | 3/2 | 108900.20 | | | | | 2p6.6f | 2F* | 5/2 | 109062.32 | | | 7/2 | 109062.35 | | | | | 2p6.6g | 2G | 9/2 | 109072.05 | | | 7/2 | 109072.05 | | | | | 2p6.6h | 2H* | 11/2 | 109073.97 | | | 9/2 | 109073.97 | | | | | 2p6.7p | 2P* | 1/2 | 110203.58 | | | 3/2 | 110207.99 | | | | | 2p6.8s | 2S | 1/2 | 112129.20 | | | | | 2p6.7d | 2D | 5/2 | 112197.05 | | | 3/2 | 112197.17 | | | | | 2p6.7f | 2F* | 5/2 | 112301.47 | | | 7/2 | 112301.47 | | | | | 2p6.7g | 2G | 9/2 | 112307.79 | | | 7/2 | 112307.79 | | | | | 2p6.7h | 2H* | 11/2 | 112309.06 | | | 9/2 | 112309.06 | | | | | 2p6.7i | 2I | | 112309.45 | | | | | 2p6.8p | 2P* | 1/2 | 113030.25 | | | 3/2 | 113033.09 | | | | | 2p6.9s | 2S | 1/2 | 114289.36 | | | | | 2p6.8d | 2D | 5/2 | 114332.68 | | | 3/2 | 114332.74 | | | | | 2p6.8f | 2F* | 5/2 | 114403.55 | | | 7/2 | 114403.55 | | | | | 2p6.8g | 2G | 7/2 | 114407.88 | | | 9/2 | 114407.88 | | | | | 2p6.8h | 2H* | 11/2 | 114408.74 | | | 9/2 | 114408.74 | | | | | 2p6.8i | 2I | | 114409.02 | | | | | 2p6.9p | 2P* | 1/2 | 114896.79 | | | 3/2 | 114898.72 | | | | | 2p6.10s | 2S | 1/2 | 115764.99 | | | | | 2p6.9d | 2D | 5/2 | 115794.39 | | | 3/2 | 115794.44 | | | | | 2p6.9f | 2F* | 7/2 | 115844.60 | | | 5/2 | 115844.60 | | | | | 2p6.9g | 2G | 7/2 | 115847.67 | | | 9/2 | 115847.67 | | | | | 2p6.9h | 2H* | 11/2 | 115848.28 | | | 9/2 | 115848.28 | | | | | 2p6.9i | 2I | | 115848.51 | | | | | 2p6.10p | 2P* | 1/2 | [ 116193.7] | | | 3/2 | [ 116195.1] | | | | | 2p6.10d | 2D | 5/2 | 116838.45 | | | 3/2 | 116838.48 | | | | | 2p6.10f | 2F* | 5/2 | 116875.25 | | | 7/2 | 116875.25 | | | | | 2p6.10g | 2G | 7/2 | 116877.54 | | | 9/2 | 116877.54 | | | | | 2p6.10h | 2H* | 11/2 | 116878.04 | | | 9/2 | 116878.04 | | | | | 2p6.10i | 2I | | 116878.13 | | | | | 2p6.11g | 2G | 9/2 | 117639.51 | | | 7/2 | 117639.51 | ------------------------|--------|------|-------------------| | | | | Mg III .2p6.(1S<0>) | Limit | --- | 121267.61 | | | | | 2p5.3s2 | 2P* | 3/2 | 402590 | | | 1/2 | 404510 | | | | | 2p5.(2P*).3s.3p.(3P*) | 4S | 3/2 | 428957 | | | | | 2p5.(2P*).3s.3p.(3P*) | 4D | 7/2 | 434090 | | | 5/2 | 434633 | | | 3/2 | 435190 | | | | | 2p5.3s.3p? | | | 435200 | | | | | 2p5.(2P*).3s.3p.(3P*) | 4D | 1/2 | 435640 | | | | | 2p5.(2P*).3s.3p.(3P*) | 4P | 5/2 | 437570 | | | 3/2 | 438167 | | | | | 2p5.3s.3p? | | | 439300 | | | | | 2p5.(2P*).3s.3p.(3P*) | 2D | 5/2 | 439540 | | | | | 2p5.3s.3p? | | | 440200 | | | | | 2p5.(2P*).3s.3p.(3P*) | 2P | 3/2 | 441330 | | | | | 2p5.3s.3p? | | | 445100 | | | | | 2p5.3s.3p? | | | 457300 | | | | | 2p5.3s.3p? | | | 458500 | | | | | 2p5.(2P*).3s.3p.(1P*) | 2P | 3/2 | 459800? | | | | | 2p5.3s.3p? | | | 460100 | | | | | 2p5.(2P*).3s.3p.(1P*) | 2S | 1/2 | 464930? | | | | | 2p5.(2P*).3p2.(1D) | 2P* | 1/2 | 477490 | | | 3/2 | 478260 | | | | | 2p5.(2P*).3p2.(3P) | 4P* | 5/2 | 483373 | | | | | 2p5.(2P*).3p2.(3P) | 4D* | 7/2 | 486856 | | | | | 2p5.(2P*).3s.4s.(3S) | 4P* | 5/2 | 487205 | | | | | 2p5.(2P*).3p2.(3P) | 4D* | 5/2 | 488587 | | | | | 2p5.(2P*).3s.3d.(3D) | 4F* | 9/2 | 489383 | | | | | 2p5.(2P*).3s.3d.(3D) | 4P* | 5/2 | 489440 | | | | | 2p5.(2P*).3s.4s.(3S) | 2P* | 1/2 | 491330 | | | 3/2 | 491590 | | | | | 2p5.(2P*).3s.3d.(3D) | * | 3/2 | 492760 | | | | | 2p5.(2P*).3s.3d.(3D) | 2P* | 1/2 | 493800 | | | | | 2p5.(2P*).3s.4s.(1S) | 2P* | 3/2 | 494390 | | | 1/2 | 495050 | | | | | 2p5.(2P*).3p2.(3P) | 2P* | 1/2 | 501730 | | | 3/2 | 505780 | | | | | 2p5.3s.4d? | * | | 516420 | | | | | 2p5.3s.5s? | * | | 517060 | | | | | 2p5.3s.4d? | * | | 517300 | | | | | 2p5.3s.4d? | * | | 517890 | | | | | 2p5.3s.5s? | * | | 518560 | | | | | 2p5.3s.4d? | * | | 519350 | | | | | 2p5.3s.4d? | * | | 519750 | | | | | 2p5.3s.5s? | * | | 521780 | | | | | 2p5.3s.4d? | * | | 522030 | | | | | 2p5.3s.4d? | * | | 522740 | | | | | 2p5.3s.5d? | * | | 528070 | | | | | 2p5.3s.5d? | * | | 528460 | | | | | 2p5.3s.5d? | * | | 529070 | | | | | 2p5.3s.5d? | * | | 529350 | | | | | 2p5.3s.5d? | * | | 530390 | | | | | 2p5.3s.6d? | * | | 533670 | | | | | 2p5.3s.6d? | * | | 534220 | | | | | 2p5.3s.6d? | * | | 535220 | | | | | 2p5.3s.6d? | * | | 536280 | | | | | 2p5.3s.7d? | * | | 537690 | | | | | 2p5.3s.7d? | * | | 538820 | | | | | 2p5.3s.6d? | * | | 539780 | | | | | 2p5.3s.8d? | * | | 541100 | | | | | 2p5.3s.9d? | * | | 541480 | | | | | 2p5.3s.9d? | * | | 542560 | | | | | 2p5.3s.7d? | * | | 543210 | ------------------------|--------|------|-------------------| | | | | Mg III .2p5.3s.(3P*<2>) | Limit | --- | 546908 | ------------------------|--------|------|-------------------| | | | | Mg III .2p5.3s.(3P*<1>) | Limit | --- | 548136 | ------------------------|--------|------|-------------------| | | | | Mg III .2p5.3s.(3P*<0>) | Limit | --- | 549120 | ------------------------|--------|------|-------------------| | | | | Mg III .2p5.3s.(1P*<1>) | Limit | --- | 552798 | ------------------------------------------------------------- Query time: 0.5 sec [ASD Home] [Lines Query] [Levels Query] [List of Spectra] [Ground States and Ionization Energies] [Bibliography] [Help] NIST Physics Laboratory