Absorption Band Systems of SiO and GeO in the Schumann Region

Configuration Interaction Study of the Low-Lying Electronic States of Silicon Monoxide

“…Among other low-lying states reported here, the 5 Π state lies at T e ) 59 809 cm -1 . The estimated r e and ω e of this state are 1.80 Å and 618 cm -1 , respectively.…”

“…The electronic structure and spectroscopic properties of silicon monoxide have been the subject of a number of experimental as well as theoretical investigations over the past several decades − for its astrophysical interest and its similarity to CO. The ultraviolet band system of SiO was first observed by Jevon 1 in the range of 2176.6−2925.3 Å.…”

“…The Franck−Condon factor and r -centroids for some bands of the A 1 Π−X 1 Σ + system have been determined . The absorption spectra of the gaseous SiO, GeO, and SnO in the region of 1250−2000 Å have been examined by Barrow and co-workers. , The vibrational analyses of a number of new band systems are also carried out by these authors. Spectroscopic constants of 11 states of SiO have been reported.…”

Gas-Phase Preparation of Subvalent Germanium Monoxide (GeO, X1Σ+) via Non-Adiabatic Reaction Dynamics in the Exit Channel

“…39,40 Germanium monoxide has been characterized spectroscopically both experimentally 41−43 and theoretically 44−46 and oxygen (O 2 ). 47,42,48,49 Trickle and co-workers extended this range to the vacuum ultraviolet region in an inductively heated furnace, thus characterizing the X 2 Σ + , A 2 Π, and B 2 Σ + states. 50 However, whereas subvalent germanium monoxide has been successfully characterized spectroscopically, no route for preparing divalent germanium monoxide (GeO, 9) in a directed synthesis has been developed.…”

“…From carbon to silicon and germanium, the bond lengths increase from 1.128 Å to 1.512 and 1.617 Å, respectively. Germanium monoxide has emerged as a key reactive intermediate in the fabrication of integrated optics and silicon–germanium alloy-based microelectronic devices due to enhanced electron and hole mobilities compared to those of silicon. , Germanium monoxide has been characterized spectroscopically both experimentally − and theoretically − by exploiting ultraviolet–visible spectroscopy in gas discharges of germanium tetrachloride (GeCl 4 ) vapor and oxygen (O 2 ). ,,, Trickle and co-workers extended this range to the vacuum ultraviolet region in an inductively heated furnace, thus characterizing the X 2 Σ + , A 2 Π, and B 2 Σ + states …”