Abstract
Photoinduced molecular detachment has been investigated for methylene iodide (CH2I2) and several related compounds (CH2Br2, CH2Cl2 and CF2Br2). Multiphoton excitation of these molecules at 310 nm gives rise to halogens in the D′ state. Femtosecond pump-probe experiments on the dissociation of these compounds indicate that the process is extremely fast (<60 fs) and proceeds without an intermediate. In addition to the characteristic D′→A′ fluorescence at 342 nm, photodissociation of CH2I2 also produces several fluorescence bands in the 260–290 nm region. The CH2I2 transients show characteristic I2 vibrational coherence. Time resolved data collected by detection at 272 nm also demonstrate clear, fast decaying rotational anisotropy, analysis of which reveals a distribution of rather high rotational levels of I2. Based on analysis of the dissociation time, rotational anisotropy and vibrational coherence, and on the estimated partitioning of energy in the fragments, an I2 concerted molecular detachment mechanism has been proposed.
Sign-in/Register to access full text options 
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.
