Two-step laser spectroscopy of the np 2P1/2,3/2 Rydberg levels in thallium

✍ Scribed by M. Riaz; Shaukat Mahmood; M. Anwar-ul-Haq; M.A. Baig

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 331 KB
• Volume: 244
• Category: Article
• ISSN: 0030-4018
• DOI: 10.1016/j.optcom.2004.09.052

✦ Synopsis

New data on the energies and quantum defects of the highly excited Rydberg levels of thallium are presented using the two-step resonant excitation spectroscopic technique. The spectra were observed using two dye lasers simultaneously pumped by the SHG 532 nm and THG 355 nm of a Nd:YAG laser in conjunction with a thermionic diode ion detector. The Rydberg series 6s 2 np 2 P 1/2 (15 6 n 6 31) and np 2 P 3/2 (15 6 n 6 56) have been studied via the 6s 2 7s 2 S 1/2 intermediate state. The first ionization potential is derived as 49266.66(5) cm À1 , which is in good agreement with the earlier work. The relative intensities of the np 2 P 1/2,3/2 series decrease monotonically and follow the 1/n 2.3 scaling.