Application of coincidence Doppler broadening spectroscopy to simple hydrocarbons

作者：Djourelov N^*; Suzuki T; Ito Y; Shantarovich V; Ito Y; Kondo K; Onoe J

来源：Chemical Physics, 2004, 298(1-3): 183-187.

DOI：10.1016/j.chemphys.2003.11.021

Three simple hydrocarbons: methane, ethane, and ethylene in solid state at the temperature of liquid nitrogen were studied by coincidence Doppler-broadening (CDB) spectroscopy and positron annihilation lifetime spectroscopy (PALS). Difference in the momentum distributions of sigma- and pi-bond electrons was observed by CDB spectroscopy. Breaking of the weak pi-bonds in ethylene due to the positron irradiation and trapping of positrons by anion molecules and/or anion radicals cause inhibition in the Ps formation in ethylene observed by PALS. The breaking of the pi-bonds in ethylene was detected also as a significant change in the shape of ethylene to methane CDB ratio with the elapsed experiment time.

• 出版日期2004-3-8