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Studies on the Optogalvanic Effect and Isotope-Selective Excitation of Ytterbium in a Hollow Cathode Discharge Lamp Using a Pulsed Dye Laser
Volume 67, Number 9 (Sept. 2013) Page 1036-1041
PANKAJ KUMAR,* JITENDRA KUMAR, OM PRAKASH, VINOD K. SAINI, SUDHIR K. DIXIT, and SHANKAR V. NAKHE
This paper presents studies on the pulsed optogalvanic effect and isotope-selective excitation of Yb 555.648 nm (0 cm−1 → 17 992.007 cm−1) and 581.067 nm (17 992.007 cm−1 → 35 196.98 cm−1) transitions, in a Yb/Ne hollow cathode lamp. The Yb atoms were excited by narrow linewidth (500–1000 MHz) Rh110 and Rh6G dye based pulsed lasers. Optogalvanic signal inversion for ground state transition at 555.648 nm was observed beyond a hollow cathode discharge current of 8.5 mA, in contrast to normal optogalvanic signal at 581.067 nm up to maximum current of 14 mA. The isotope-selective excitation studies of Yb were carried out by recording Doppler limited optogalvanic signals as a function of dye laser wavelength. For the 581.067 nm transition, three even isotopes, 172Yb, 174Yb, and 176Yb, and one odd isotope, 171Yb, were clearly resolved. These data were compared with selective isotope excitation by 10 MHz linewidth continuous-wave dye laser. For 555.648 nm transition, isotopes were not clearly resolved, although isotope peaks of low modulation were observed.
Index Headings: Hollow cathode lamp; Dynamic optogalvanic signal; Isotope-selective excitation.