Rotationally resolved spectra of jet-cooled RuSi

Journal ArticleWe report the first gas-phase spectroscopic investigation of diatomic ruthenium silicide (RuSi). The molecules were produced by laser ablation of a Ru disk into a flow of helium carrier gas containing 0.5% SiH4, and were cooled in a supersonic expansion. The RuSi molecules were then studied using resonant two-photon ionization spectroscopy. Investigations conducted in the spectral range from 18 800 to 23 800 cm?1 show a large number of excited vibronic levels that cannot readily be grouped into electronic band systems. The ground state is been demonstrated to be of 3?3 symmetry, deriving from the 2?314?1 electronic configuration. Correcting for the effects of the spin-uncoupling operator, the ground state bond length (r0) is determined to be 2.0921?0.0004 ? (1? error limit). Diatomic RuSi is shown to have strong drr-prr bonds, unlike the isovalent AlCo molecule

Optical spectroscopy of jet-cooled NiSi

Journal ArticleThe electronic states of gaseous diatomic NiSi have been investigated using the combined techniques of resonant two-photon ionization spectroscopy, dispersed fluorescence spectroscopy, and density functional computations. A single electronic band system, designated as the [8.0]1?X 1?+ system, has been found in the 17 500?19 500 cm-1 range, and three bands of this system have been rotationally resolved and analyzed. To shorter wavelengths, the spectrum becomes much more congested and intense, and four bands in this region have been rotationally resolved and analyzed as well. A dispersed fluorescence investigation has allowed the measurement of 17 vibrational levels of the ground state. Through this work, the ground state of 58Ni28Si is demonstrated to have 1?+ symmetry, with r0=2.0316(4) ?, ?e=467.43(30) cm-1, and ?exe =2.046(21) cm-1. These results are in good agreement with the results of density functional computations performed on the ground state. Comparisons to AlCu and CuSi demonstrate that NiSi has a double bond, while these related molecules are best considered as having a single s-bond

Optical spectroscopy of RuC: 18 000-24 000 cm ?1

Journal ArticleThe optical spectrum of diatomic RuC has been recorded from 17 800 to 24 200 cm-1. Three previously unidentified excited electronic states were analyzed and identified as having ?'=0, ?'=2, and V853. The ?'=3 state was determined to be a 3?3 state that is suggested to arise from a mixture of the 10??11?25rr?2??12?16rr1 and 10??11??5rr?2? ?12??6rr1 electronic configurations. Three additional bands belonging to the previously observed [18.1] 1II?X1? system were analyzed to obtain B'e=0.558 244(48) cm-1, ?'e=0.004 655(27) cm-1, ?'e=887.201(37) cm-1, and ?'ex'e=55.589(7) cm-1 for the 102Ru 12C isotopomer (1? error limits). A Rydberg-Klein-Rees analysis was then performed using the determined spectroscopic constants of the [18.1] 1II state, and similar analyses were performed for the previously observed states. The resulting potential energy curves are provided for the 100Ru 12C, 101Ru 12C, 102Ru 12C, and 104Ru 12C isotopic species