**************** The 13th., Lab Seminar *****************

Date: Mon, November 1, 2004  PM 1:30-

Place: No.616 Seminar room
　　　　　　 Graduate School of Information Science

Speaker: Takuya Okamoto

Title: Strong feedback effect in the vibrational relaxation of liquid water
        Chem. Phys. Lett. 384 (2004) 236

Abstract:
 We show the presence of a strong negative feedback effect in the vibrational
relaxation of the O-H stretch vibrations of liquid H2O.   The vibrational
relaxation of an O-H stretch vibration leads to the excitation of strongly
coupled low-frequency modes, which induces a deceleration of the relaxation
of other still excited vibrations.   We present a model for this feedback
model for this effect, with which we obtain a consistent interpretation of
the experimental results of recently reported femtosecond mid-infrared
pump-probe experiments and mid-infrared pump anti-Stokes Raman probe
experiments.

*********************************************************************