Very high resolution studies of chiral molecules with a Bruker IFS 120 HR: The rovibrational spectrum of CDBrClF in the range 600-2300 cm-1

摘要

The infrared spectrum of the chiral molecule CDBrClF has been measured with a resolution of 0.001 cm~(-1) and analysed in the v_(5), v_(4), v_(3) and 2v_(4) regions. The results are discussed in relation to molecular parity violation. The new Zurich high resolution Bruker spectrometer IFS 120HR prototype has an optical path length close to 10 m and records spectra with a resolution of up to 0.0007 cm~(-1). The instrumental resolving power is up to 2x;10~(6). This very high resolution makes it possible to study the dense spectra of relatively heavy molecules in detail. The high resolution facilitates, for example, the detection of resonances in the rovibrational spectra of these heavy molecules. These resonances are important because they provide information about the internal dynamics of the molecule. This was demonstrated by the identification of a complicated network of resonance systems in the highly resolved infrared (IR) spectrum of fulminic acid, HCNO [1,2]. Whereas in previous work the complex spectra of chiral molecules could only be analysed on the basis of combined FTIR and diode laser supersonic jet spectra [3,4], we are now able to analyse the room temperature spectra.