Abstract
Rotationally resolved resonant two-photon ionization spectra of jet-cooled NbMo are reported for the first time. A vibronic spectrum of NbMo was recorded in the 17 300-22 300 cm(-1) spectral region. Although the observed bands could not be grouped into electronic band systems, four excited vibronic levels with Omega=2.5 and two excited levels with Omega=3.5 were identified. The ground state of NbMo has been assigned as (2)Delta(52), deriving from a 1sigma(2)1pi(4)1delta(3)2sigma(2) configuration of the valence electrons. Rotational analysis of six bands provides a ground state rotational constant of B(0) (")=0.087 697(26) cm(-1), corresponding to a bond length of r(0) (")=2.008 09(30) A for (93)Nb(98)Mo. Correction for the effects of the spin-uncoupling operator changes the estimated bond length only slightly to r(0) (")=2.008 02(30) A. The experimentally determined value of r(0) (") is compared to that predicted using previously determined multiple bonding radii of Nb and Mo. A comparison to the known diatomic molecules composed of group V and VI metal atoms is also made.
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