Spectroscopy of the 11u(51P1) and singlet electronic states of cadmium dimer: Bond lengths and verification of ab initio potentials

Potentials of the D10u+ (61S0) and F31u(63P2) Electronic Rydberg States of Cd2 from ab Initio Calculations and Laser-Induced Fluorescence Excitation Spectra

“…Figure 2 presents excitation spectra recorded in the region from 206 to 218 nm. According to our ab initio calculated interatomic potentials reported here and previous experimental studies, 1,2,[5][6][7][8][9][10][11][12][13][14] the spectra have to be assigned as a result of an excitation from the lowest υ 00 levels to the υ 0 levels belonging to the electronic states lying above the B 1 1 u state energy barrier situated at the E at ( 5…”

“…In this article we reported on measurements with which we extend studies of Cd 2 electronic Rydberg states using a free-jet expansion beam and laser excitation at wavelengths shorter than 221 nm-the limit attained in our previous studies. 10,11 The LIF excitation spectra recorded in the 206-218 nm range using the D 1 0 u þ -(6 1 S 0 ) r X 1 0 g þ and F 3 1 u (6 3 P 2 ) r X 1 0 g þ transitions were analyzed and simulated. In the excitation to the D 1 0 u þ state, isotopically resolved vibrational components of the υ 0 = 35-54 r υ 00 = 0 progression were recorded allowing determination of the υ 0 assignment.…”

“…Similarly, a Morse function was used to represent the A 1 0 u þ state potential 8,9 (however, only for υ 0 from 19 to 54). In the case of the more complex B 1 1 u state potential, 10,11 the υ 0 r υ 00 = 0 excitation was possible only in a narrow range of υ 0 from 33 to 40. Beyond the υ 0 = 40, the excitation reaches a potential barrier and allows determination of its position and height.…”

“…In this article we report on experiments in which we extend our studies of Cd 2 electronic energy states using excitation wavelengths shorter than 221 nm, i.e., the wavelength at which evidence of the B 1 1 u state potential barrier was found. 10,11 LIF excitation spectra recorded in the range from 206 to 218 nm using the D 1 0 u þ (6 1 S 0 ) r X 1 0 g þ and F 3 1 u (6 3 P 2 ) r X 1 0 g þ transitions are presented. The molecules were produced in a continuous free-jet expansion beam crossed with a pulsed dye-laser beam.…”

“…Laser spectroscopy of 12-group van der Waals (vdW) molecules produced and ro-vibrationally cooled in a free-jet expansion beam is one of methods for investigation of molecular energy structure . It was applied, among others, in experimental studies of the a 3 1 u (5 3 P 1 ) 2 , b 3 0 u + (5 3 P 1 ), − c 3 1 u (5 3 P 2 ), , A 1 0 u + (5 1 P 1 ), , and B 1 1 u (5 1 P 1 ) , excited as well as the X 1 0 g + (5 1 S 0 ) ground ,− electronic-energy states of Cd 2 (see Figure for reference). On the basis of the experimental results, i.e., laser-induced fluorescence (LIF) excitation and dispersed emission spectra, for all of the studied potentials analytical representations were proposed except for that of the a 3 1 u state, for which a weak dipole transition moment between the X 1 0 g + and a 3 1 u states prevented excitation .…”