FRAGMENTAION OF ACETONE FOLLOWING SELECTIVE
INNER-SHELL EXCITATION USING SR SOFT X-RAYS

Isao H. Suzuki and Norio Saito

Electrotechnical Laboratory, Tsukuba, Ibaraki, 305-8568 Japan

  Fragment ions from acetone have been measured in the soft X-ray region
using monochromatized synchrotron radiation and a time-of-flight mass
spectrometer.  In comparison among p* excitation, Rydberg orbital
excitation and ionization near the CK-edges, the ionization induces a
steeper decomposition than the others, e.g. relative intensities of CnH+
become higher than CnH2+ and CnH3+.  Significant site-specific
decomposition was not found in the CK-edges and the OK-edge.