Fast-Ion-Beam Laser Spectroscopy of the B2Σ+-X2Σ+ and B2Σ+-A2Π Systems of SiO+: Experiment

High-resolution laser-induced fluorescence spectroscopy of $^{28}$Si$^{16}$O$^+$ and $^{29}$Si$^{16}$O$^+$ in a cryogenic buffer-gas cell

“…For γ X , our result agrees with that reported by Ghosh et al [34]. Cameron et al [36,37] and the later work of the same group [45], also report γ X = 0.34416 (30) GHz, but their value comes from a deperturbation analysis that considers the perturbations in the X 2 Σ + state from the nearby A 2 Π state. Thus, their γ X cannot be directly compared to the one reported here.…”

“…We find that 29 Si 16 O + is best described with Hund's case (b) βS coupling scheme as the hyperfine interaction exceeds the spin-rotation coupling. We also report spectroscopy of the (0,0) and (1,0) bands of B 2 Σ + ← X 2 Σ + of 28 Si 16 O + and find spin-rotation constants for both the X 2 Σ + and B 2 Σ + states that in some casese are incompatible with previously recommended values [34,35,36,37].…”

“…Using the vacuum UV photoelectron spectrosocpy of SiO (X 1 Σ + ), Colbourn and coworkers [44] have estimated the spectroscopic constants for three ionic states of 28 Si 16 O + : X 2 Σ + , A 2 Π, and B 2 Σ + . Later, Rosner and coworkers [35,36,37,45] measured a number of high-resolution bands of A 2 Π − X 2 Σ + and B 2 Σ + − X 2 Σ + transitions of 28 Si 16 O + from LIF studies of mass-selected fast ion beams. By fitting the entire data with a Hamiltonian model, they have obtained more precise rotational and fine-structure constants for all three states.…”

A Study of theX2Σ+andA2Π States of SiO+Using Fast-Ion-Beam Laser Spectroscopy

“…Very careful alignment of the laser beam, The fast-ion-beam laser spectroscopy apparatus has the ion beam, and the electrodes minimized background been described in some detail in previous publications light, achieving a significantly better signal-to-noise ratio ( 10 ) . For this experiment, several improvements were than in previous experiments.…”

Electronic spectroscopy of a cold SiO+ sample: Implications for optical pumping

“…For the simplest implementation of broadband laser rotational cooling, near diagonal FCFs are important so that vibrational excitation is not likely to occur during the cooling process, although in some cases it should also be possible to re-pump vibrational excitations 15,18 [19][20][21][22][23] . In addition to electronic spectroscopy 19,20,22,24 , magnetic dipole allowed transitions between fine structure components of numerous rotational levels in the X 2  + (v=0) state were also measured by Rosner's group using a separated field optical pump/probes rf-double resonance technique 21 .…”