Rovibrational energy levels of the LiOLi molecule from dispersed fluorescence and stimulated emission pumping studies

Abstract

Articles you may be interested inExperimental observation and analysis of the 3ν1(Σg) stretching vibrational state of acetylene using continuouswave infrared stimulated emission J. Chem. Phys. 139, 054201 (2013); 10.1063/1.4816524The rotational spectrum and dynamical structure of LiOH and LiOD: A combined laboratory and ab initio study A spectroscopic determination of the bond length of the LiOLi molecule: Strong ionic bonding Rotational coherence spectroscopy of para-cyclohexylaniline by stimulated Raman-induced fluorescence depletion and stimulated emission pumping Dispersed fluorescence ͑DF͒ and stimulated emission pumping ͑SEP͒ experiments have been carried out on the jet-cooled 7 Li 16 O 7 Li molecule. Rotationally resolved SEP bands to 2 l (lϭ0,2) vibrational angular momentum levels show that LiOLi is a linear molecule. The DF experiments have resulted in the measurement of 54 ( 1 , 2 l ,0) levels of the X 1 ⌺ g ϩ ground state, up to 6000 cm Ϫ1 . The energy levels determined experimentally are amazingly close to those calculated very recently for a high-level ab initio LiOLi(X 1 ⌺ g ϩ ) potential surface. The DF vibrational level energies are analyzed and discussed in terms of a global fit to an 11-term power series. From the SEP experiments, effective rotational constants B 1 , 2 l ,0 for several of these vibrational levels ͓including g ϩ (lϭ0) and␦ g (lϭ2) vibrational angular momentum states for ( 1 , 2 l у2(even), 3 ϭ0) levels͔ have also been determined. The bond distance R 0 is estimated to be 1.611Ϯ0.003 Å from an extrapolation of B 1 ,0,0 values. Finally, the unusual ''Li ϩ O Ϫ2 Li ϩ '' ionic bonding and the low 2 ϭ112 cm Ϫ1 bending frequency for LiOLi(X 1 ⌺ g ϩ ) are briefly discussed.

Spectroscopic characterization of the first singlet (Ã B11) excited state of Li167O7Li

“…1,4 The laser induced fluorescence experiments were conducted in the first chamber of the apparatus, with the gate valve to the R2PI chamber closed. A pulse of a 5% N 2 O/Ar mixture ͑at 60 psi backing pressure͒ was allowed to expand through a nozzle and immediately contact the products of a laser-vaporization plume from a lithium ''wafer'' ͑see below͒ which was continuously rotated but not translated.…”

“…[1][2][3][4] The LiOLi ground state, unlike its valence isoelectronic HOH analogue, has been shown in SEP ͑stimulated emission pumping͒ experiments to be linear, with a bond length (R 0,0,0 Љ ) of 1.611Ϯ0.003 Å. 4 Here, we describe extensive laser-induced fluorescence ͑LIF͒ and resonance-enhanced two-photon ionization ͑R2PI͒ measurements in which we have determined the rotational energy levels of several excited ( 1 Ј , 2 Ј , 3 Ј) vibrational states of the à 1 B 1 (KЈϭ1) electronically excited state of 7 Li 16 O 7 Li. From such measurements, we estimate the effective AЈ,BЈ,CЈ rotational constants for each 1 …”

Structures and Heats of Formation of Simple Alkali Metal Compounds: Hydrides, Chlorides, Fluorides, Hydroxides, and Oxides for Li, Na, and K

“…1,2 Gas phase alkali metal hydroxides have been more difficult to study because monomers (MOH), dimers (M 2 O 2 H 2 ), and even trimers may be simultaneously present under the majority of the experimental conditions that were used. 3,4 The dialkali oxides M 2 O, especially Li 2 O, have been studied extensively, [5][6][7] although there are uncertainties regarding their thermochemistry. For example, experiments under different conditions have been performed to determine the alkali superoxide bond dissociation energies (BDEs), but their results are somewhat uncertain.…”

Resonant two-photon ionization spectroscopy of BNB

“…27 Of these, all of the species with 17 or more valence electrons are bent, and all of the species with 10-16 valence electrons are linear in their ground electronic states, exactly in accord with Walsh's rule. 5 To date, no 11-electron molecules have been structurally investigated in detail and our study of BNB is designed, in part, to fill this gap. 6 The eight electron molecule, Li 2 O, is linear.…”