Pulsed PFOODR Spectroscopy of Triplet Rydberg States of 7Li2

New observation of the , 13Δg, and 23Πg states and molecular constants with all 6Li2, 7Li2, and 6Li7Li data

“…Linton et al populated the 1 3 D g v = 0-3 levels of 6 Li 2 through F 1 R g þ À 1 3 D g collisions [8]. The 2 3 R g þ v ¼ 8-14, 3 3 R g þ v ¼ 9-20, 4 3 R g þ (one level), 1 3 D g v = 9-25, 2 3 P g v = 0-45, 1 3 R g À v ¼ 0-14, 3 3 P g v = 7-11, and 2 3 D g v = 8-14 levels of 7 Li 2 were observed by CW and pulsed PFOODR spectroscopy [9][10][11][12][13][14][15][16][17][18]. Russier et al observed the 7 Li 2 2 3 P g v = 2, 6, 14 levels by PFOODR excitation and the 7 Li 2 1 3 D g v = 0-2 levels by collision-induced population and v = 10, 15, 17 by PFOODR excitation [19].…”

“…All CW PFOODR data of 7 Li 2 , 6 Li 2 , and 6 Li 7 Li are given in Tables 1-3 of the Supplementary materials [22]. Term values observed by pulsed PFOODR excitation are not included in the fits due to less accuracy [9,20].…”

Spectroscopy of Lithium Atoms and Molecules on Helium Nanodroplets

“…This allows a detailed comparison between the spectroscopy of free molecules and molecules on the droplet. The most accurate experimental data have been obtained by perturbation facilitated optical–optical double resonance (PFOODR) spectroscopy, where for the 2 3 Π g state all three isotopomers of the Li dimer have been investigated. − In order to use helium nanodroplets in future experiments as a matrix for the electronic spectroscopy of tailored molecules on their surface, we are interested in the accuracy of spectroscopic constants, which can be extracted from their spectra. Therefore, we determine the molecular constants for the sake of comparison with the literature values of free molecules.…”