Jump to main content
Jump to site search

Issue 27, 2008
Previous Article Next Article

The ionization energy of Be2, and spectroscopic characterization of the (1)3Σ +u, (2)3Πg, and (3)3Πg states

Author affiliations

Abstract

Low lying electronic states of the beryllium dimer were investigated by laser induced fluorescence (LIF) and resonance enhanced multiphoton ionization (REMPI) techniques. Be2 was formed by pulsed laser ablation of Be metal in the presence of helium carrier gas, followed by a free jet expansion into vacuum. Several previously unobserved states of the dimer were characterized. These included transitions of the triplet manifold (2)3Πg ← (1)3Σ+u and (3)3Πg ← (1)3Σ+u, for which rotationally resolved bands were obtained. In addition, transitions to the v′ = 10–18 vibrational levels of the A 1Πu state were recorded. Photoionization efficiency (PIE) measurements were used to determine an accurate ionization energy (IE) for Be2 of 7.418(5) eV and the term energy for (1)3Σ+u. Above the ionization threshold the PIE spectrum was found to be highly structured, consisting of overlapping Rydberg series that converged on excited vibrational levels of Be2+. Analysis of these series yielded a vibration frequency for the X 2Σ+u state of 498(20) cm−1. The bond dissociation energy for Be2+, deduced from the IE measurement, was 16 072(40) cm−1. Multi-reference configuration interaction (MRCI) calculations were carried out for Be2 and Be2+, yielding results that were in excellent agreement with the experimental observations.

Graphical abstract: The ionization energy of Be2, and spectroscopic characterization of the (1)3Σ+u, (2)3Πg, and (3)3Πg states

Back to tab navigation

Publication details

The article was received on 07 Mar 2008, accepted on 10 Apr 2008 and first published on 29 May 2008


Article type: Paper
DOI: 10.1039/B803975E
Phys. Chem. Chem. Phys., 2008,10, 4006-4013

  •   Request permissions

    The ionization energy of Be2, and spectroscopic characterization of the (1)3Σ+u, (2)3Πg, and (3)3Πg states

    J. M. Merritt, A. L. Kaledin, V. E. Bondybey and M. C. Heaven, Phys. Chem. Chem. Phys., 2008, 10, 4006
    DOI: 10.1039/B803975E

Search articles by author

Spotlight

Advertisements