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Chemical Research in Chinese Universities ›› 2011, Vol. 27 ›› Issue (3): 508-511.

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Ionization and Fragmentation of Butanone Clusters Irradiated by Photons at 355 and 118 nm

  

  1. Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, P. R. China
  • Received:2010-06-07 Revised:2010-09-30 Online:2011-05-25 Published:2011-04-29
  • Contact: DING Da-jun E-mail:dajund@mail.jlu.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(Nos.10404008, 10774056 and 10974070) and Doctoral Fund of Ministry of Education of China.

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Abstract: Time-of-flight(TOF) mass spectra of molecular butanone clusters were measured under the irradiation of photons at 355 and 118 nm. Butanone molecular parent ion and several series of butanone cluster fragments such as (CH3COC2H5)nH+, (CH3COC2H5)nC2H5+, (CH3COC2H5)nCH3CO+ and (CH3COC2H5)nC2H5CO+ were observed. Odd-even variation pattern in the intensity of (CH3COC2H5)nCH3CO+ is obvious from n=4 to 8. A connection is established between the fragment clusters (CH3COC2H5)nCH3CO+ and the neutral clusters (CH3COC2H5)n+1 based on the consideration of butanone cluster dissociation mainly by losing a radical C2H5?. The stability variation of the neutral clusters calculated via the HF-B3LYP method based on DFT is in agreement with the observed phenomena experimentally, indicating (CH3COC2H5)n+1(n+1=5,7) with a ring structure are with higher stability over the adjacent even-number clusters.

Key words: Cluster, Ionization, Fragment, Butanone