High-resolution studies of the A2Π-X2Π system of rotationally cooled SO+

Mid-infrared diode laser spectroscopy of SO+

“…Precise molecular constants for the ground and t = 1 vibrational states have been determined by a weighted least-squares fit combined our observed lines with the microwave data reported previously. Our results are in good agreement with those of Milkman et al [17] obtained from a nonlinear least-squares fitting procedure followed by a leastsquares merging procedure. …”

“…The derived spin-orbit coupling constant A 1 , the rotational constant B 1 and the band origin v 0 are in good agreement with those calculated with the equilibrium parameters from Ref. [17], as shown in Table 2. The band origin of the fundamental band of SO + was determined to be 1291.5299(27) cm À1 .…”

“…Our fitting results are only marginally improved over those of Amano et al [18], as one can see in Table 2. The merged values for molecular constants of the ground state from a analysis of all the available electronic and microwave spectrum by Milkman et al [17] are also listed in Table 2 for comparison. They are in good agreement with each other.…”

“…Hardwick et al [15] re-investigated the 0-5, 0-6, 1-5 and 1-6 bands in higher resolution and reported a self-consisted molecular constants for t 0 = 0 and 1 levels of A and for t 00 = 4-9 levels of X. The A 2 P i À X 2 P r system of SO + have also been observed in rotationally cold supersonic expansion and the most complete molecular constants for the X 2 P r and A 2 P i states have been obtained [16,17]. In 1991, Amano et al reported the microwave spectrum of SO + and determined more precise molecular constants for the ground state [18].…”

An investigation of the SO(X3Σ-) molecule by multiphoton ionization spectroscopy

“…The features observed in figure 2 were thus initially attributed to resonance enhanced MPI of SO(X3Z -) to the X2II state of the ion, an assumption which was subsequently confirmed from measurements made from the experimental spectra. 1275.99 _+ 0.01 cm -~ (v + = 1-2) determined by ion emission spectroscopy [41]. In addition, the separation between the first and third spin-orbit components of the v' = 0 ~ v" = 0 band shown in figure 2(a), when multiplied by three, was measured as (380.8 + 0.8) cm '.…”