Analysis of the rotation-vibration-inversion infrared spectrum of the ν 10 and ν 14 bands of silacyclobutane

Analysis of high resolution FTIR spectra from synchrotron sources using evolutionary algorithms

“…The symmetry of the various energy levels (rotation, vibration, inversion) follows that described recently for the ν10 band of silacyclobutane (SCB). 24 As the ν13 ring deformation of TMS has A1 vibrational symmetry, its infrared spectrum is composed of two sets of a-type rovibrational transitions (0 + → ν13 + , 0 -→ ν13 -) that connect states of the same inversion parity. As seen for SCB, two sets of c-type rotation-vibration-inversion transitions (0 -→ 1 + , 0 + → 1 -) that connect states of opposite inversion parity are also symmetry-allowed.…”

Analysis of the Coriolis perturbed rovibrational spectrum of the C O asymmetric stretch and C C symmetric stretch of trimethylene oxide

“…In both cases, the barriers to planarity (274.2(2) cm -1 (TMS) 7 ; 440(3) cm -1 (SCB) 8 ) are considerably higher and give rise to inversion tunnelling features in the microwave and far infrared spectra. 7,[9][10][11][12][13][14] TMO has been the subject of numerous spectroscopic studies in the microwave, 3,4,15,16 millimeterwave, 17 far infrared 5,6,[18][19][20] and infrared regions. [21][22][23][24][25][26][27] These investigations have largely focused on the ground and ring puckering vibrational states.…”