Research Information System
43rd Conference of The European Group on Atomic Systems (EGAS), Switzerland, 1 - 04 July 2011, pp.113, (Summary Text)
Vanadium is one of the iron-group elements which are important for astrophysics. The spectrum of V is characterized by a broad hyperfine structure caused by the large nuclear magnetic dipole moment of the predominant stable isotope 51V (nuclear spin of I = 7/2 and natural abundance more than 99%).
Experimental hyperfine structure analysis of neutral vanadium was performed in the Laser Centre of the University of Latvia with a high-resolution Fourier transform (FT) spectrometer, Bruker IFS 125HR at 0.03 cm-1 resolution. A hollow-cathode discharge was used to evaporate vanadium and to excite the free atoms.
The aim of the present study is the determination of magnetic dipole hyperfine structure constants A for the energetically low lying levels belonging to the term 3d34s4p 6G of V I. The spectral lines combining the energy levels of this term lie in the wavelength range from 470 nm to 490 nm and, as a rule, have very low intensity. Therefore the spectrum of V I was recorded using an optical bandpass lters in the setup of the high-resolution FT spectrometer to optimize the signal-to-noise ratio.
Nine transitions have been measured and analyzed, the wavelengths of which are listed in the NIST Atomic Spectra Database [1] and the NBS wavelength tables [2]. The measured hyperfine structure patterns were fitted using Voigt profile functions by means of a fit program called FITTER [3]. All hyperfine structures are not completely resolved. Therefore the line profiles were fitted fixing the hyperfine structure constants of the upper levels belonging to the term 3d34s5s 6F, which are well known from the literature [4]. New results are presented for all six levels belonging to the 3d34s4p 6G term.