Ultrasonic vibrational relaxation in liquid diiodomethane

Pak Kon Choi, Kenshiro Takagi

Research output: Contribution to journalArticle


Ultrasonic velocity and absorption in liquid diiodomethane have been measured in the frequency range 100 MHz~1.7 GHz at the temperatures of 10° and 20°C using the highresolution Bragg reflection method. Vibrational relaxation was observed which was ascribed to all the vibrational modes except the lowest. Vibrational relaxation frequency β in fifteen liquids obtained in our previous and present works is plotted as a function of fundamental vibration frequency ν of the relevant trigger mode. The relation log β=A-kν well fits the data within the factor of two, where A and k are constants. This indicates fundamental vibration frequency is a dominant factor in determining relaxation frequency.

Original languageEnglish
Pages (from-to)191-194
Number of pages4
JournalJournal of the Acoustical Society of Japan (E)
Issue number4
Publication statusPublished - 1 Jan 1988

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