Progress in Finding New Energy Levels Using Laser Spectroscopy

Abstract

The necessary tools for determining a fast and, during an experimental run, possible location of a new energy level are presented, using the findings and characterization of a new level of the La atom as an example. Due to the corresponding computer programs, the observations gained during the experiment can be immediately used.

New Energy Levels of Neutral Lanthanum Derived from an Optogalvanic Spectrum between 5610 and 6110 Å

“…Further analysis of the spectrum is in progress. Two additional levels at 41,465.181 and 41,681.602 cm −1 were published earlier [14]. In the OG spectrum treated here, we found additional lines in which these levels are involved, confirming their existence.…”

“…The levels found during this investigation are listed in Table 1 and all have even parity. Additionally, the levels 41,465.181 and 41,681.502 cm −1 , published in reference [14], are listed with all classified lines.…”

“…By tuning the monochromator, we could find LIF lines, which intensities are modulated with the chopper frequency, and were able to determine their wavelength. The combination of all information (LIF and laser wavelengths and hf pattern of the investigated transition) allowed us to discover up to now unknown energy levels, as described in references [12,14]. A sketch of the apparatus used can be found e.g., in reference [11].…”

“…The ground state has designation 5d6s 2 2 D 3/2 . Altogether, today, around 340 energy levels with even parity and 160 levels with odd parity are known [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

“…The fit of the hf patterns was performed using the program "Fitter" [20]. Methods for finding new energy levels are described in references [12,14]. Some information we could obtain from an available Fourier transform spectrum [21,22].…”