First Spectrum of Tungsten

Abid Husain, S. Jabeen, Abdul Wajid


The spectroscopic data of tungsten (W) is important for plasma science, as it is used as a diverter and in ITER. We have recorded the spectrum of tungsten on a 1.5-m Wadsworth spectrograph in the 2100--4900 Å wavelength range. The ground configuration of the neutral tungsten is 5d\({}^{4}\)6s\({}^{2}\). First excited configurations in the odd parity system are 5d\({}^{3}\)6s\({}^{2 }\)(6p + 7p + 5f + 6f) + 5d\({}^{4}\)6s6p. The 5d\({}^{4}\)6s6p configuration has already been studied. We have identified hundreds of lines in this spectrum and confirmed fifty nine levels of the 5d\({}^{4}\)6s6p configuration. Relativistic Hartree-Fock (HFR) and least squares fitted (LSF) parametric calculations were carried out to interpret the observed spectrum. We have found good agreement with the previously published data.


Tungsten, Wadsworth spectrograph; Cowan’s computer code

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J.E. Mack, The spectrum of neutral tungsten, J. Phy. Review 63, 7 – 8 (1943).

Y. Shadmi and E. Caspi, Theoretical interpretation of the even levels in the first spectrum of tungsten, J. Res. Nat. Bur. Stand. Sect. A 72, 757 (1968).

D.D. Laun and C.H. Corliss, The first spectrum of tungsten, J. Res. Nat. Bur. Stand. Sect. A 72, 609 (1968).

C.H. Corliss, New even levels and classified lines in the first spectrum of tungsten (W I), J. Res. Nat. Bur. Stand. Sect. A 73, 277 (1969).

A.E. Kramida and T. Shira, Compilation of wavelengths, energey levels and transition probabilities of WI and WII, J. Phys. Chem. Ref. Data 35, 301 (2006), DOI: 10.1063/1.1836763

J.F. Wyart, Interpretation of the odd parity, energy levels in the spectrum of neutral tungsten, J. Phys. B: At. Mol. Opt. Phys. 43 (2010), DOI: 10.1088/0953-4075/43/7/074018.

R.A. Sawyer, Experimental Spectroscopy, Prentice-Hall, Inc., New York (1951), DOI: 10.1002/jps.3030401122.

R.D. Cowan, Theory of atomic structure and spectra, University of California Press, Berkeley, CA, USA (1981).

A. Kramida, Yu. Ralchenko, J. Reader and NIST ASD Team, NIST Atomic Spectra Database (Ver. 5.3), (2015).



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