HIGH-RESOLUTION FOURIER TRANSFORM SPECTROSCOPY OF LANTHANUM IN Ar DISCHARGE IN THE NEAR-INFRARED

Progress in Finding New Energy Levels Using Laser Spectroscopy

“…Comparison of the available FT spectrum [8] (two overlapped spectra under different discharge conditions shown in red and blue) and optogalvanic spectra in the same wavelength range.…”

“…As example, the results when setting the excitation wavelength to 5683.40 Å, are described. Comparison of the available FT spectrum [8] (two overlapped spectra under different discharge conditions shown in red and blue) and optogalvanic spectra in the same wavelength range. In the OG spectra the red trace is the transmission signal of a marker etalon with free spectral range of 367.3 MHz.…”

The Role of the Hyperfine Structure for the Determination of Improved Level Energies of Ta II, Pr II and La II

“…The near infrared part was analyzed in co-operation with the group of Basar (Physics Department, Istanbul University, Istanbul, Turkey). This was the first investigation of a La spectrum at wavelengths higher than 10,600 Å (investigated spectral range 8330-16,600 Å ) [10]. The spectra were calibrated carefully using Ar II spectral lines.…”

“…These requirements can be fulfilled by means of Fourier-transform (FT) spectroscopy. Several co-operations led to the availability of spectra of Ta [8], Pr [9], and La [10]. In these spectra, much more lines can be found than listed in commonly used wavelength tables [11].…”

Optogalvanic spectroscopy of the hyperfine structure of the 5p65d 2D3/2,Olmschenk1, Banner2, Hankes3 et al. 2017Phys. Rev. A3040View full textAdd to dashboardCite

“…The hyperfine structure of singlyionized lanthanum has been investigated with a range of techniques [11,12], including experimental observations using grating spectroscopy [13], interferometry [14], collinear ion-beam-laser spectroscopy [15][16][17][18], Fourier transform spectroscopy [2,19], a laser and radiofrequency double resonance technique [20], and laser-induced fluorescence [21][22][23], as well as theoretical calculations using a classical parametric scheme [24], a relativistic configuration-interaction method [25], and a semiempirical method [21,22]. Although many of the parameters for doubly-ionized lanthanum (La III; La 2+ ) also have been investigated experimentally [26][27][28][29][30][31][32][33][34][35] and theoretically [6,[36][37][38][39][40][41][42], the hyperfine structure of La 2+ is known for only a few energy levels.…”