Abstract
The Doppler-free two-photon excitation spectrum of the vibrationless à 1B 1←X̃ 1A 1 transition of difluorodiazirine (F 2CN 2) has been recorded with a resolution of 15 MHz using a cw single-mode dye laser coupled to an external concentric resonator. The asymmetric rotor spectrum has been analysed and more than 350 lines randomly selected from all five branches were assigned in order to fit the ground- and excited-state rotational and quartic centrifugal distortion constants. From the rotational constants the r NN and r FF distances in the ground X̃ 1A 1 and excited à 1B 1 state were determined. The geometry change upon excitation is found to be Δ r NN = 3.89(2) pm and Δ r FF = −4.09(2) pm. No perturbation in the rotational structure of the 0 0 0 band has been found. This points to a small singlet-triplet coupling matrix element in the small molecule limit.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
