科研之友
微信
新浪微博
Facebook
分享链接
摘要
In this work the high resolution synchrotron radiation Fourier transform spectrum in the range 1180-1300 cm(-1) corresponding to the COH-bending vibrational mode has been recorded and analyzed. The spectrum shows a structure analogous to a parallel band. Since the COH bending motion is one of the main contributors to the asymmetry in the torsional hindering potential barrier, the torsional barrier height in the excited state is expected to be quite different from that of the ground state. This makes the spectrum to spread over a wide region. Although the spectrum corresponding to the P- and R-branch looks very complicated, the Q-branches are well resolved and can be identified without much difficulty. It was possible to assign the spectra for K = 0 to 10 for the trans- (e(0)) species. The interesting feature of the spectra is the absence of the lines for two other lower lying gauche symmetry species e(1) and o(1). The spectra due to any perpendicular transitions were absent as well. However some weak c-type transitions from gauche states (o(1) and e(1)) in the ground state to the trans-species (e(0)) in the COD bending mode for low K-values Delta K = 0 have been seen to be present in the spectra. These along with similar transitions for the OCD vibrational band are under investigation and the results will be communicated elsewhere. In the present work, analysis of the spectrum has been carried out to obtain precise term values and molecular parameters in the excited COH-bending state for the trans-species. The results will be shown valuable to assign similar spectra for the methanol-D-2. This work represents the first reported high resolution study of this illusive vibrational mode in methanol-D-1.
- 出版日期2017-9
- 单位Canadian Light Source Inc; Saskatoon; Canadian Light Source Inc.; Saskatchewan
