TY - JOUR
T1 - Vibrational relaxation of adsorbate and adsorbent in the CO-adsorbed DM-20 zeolite system
AU - Onda, Ken
AU - Iwasawa, Yasuhiro
AU - Wada, Akihide
N1 - Funding Information:
This work has been supported by CREST (Core Research for Evolutional Science and Technology) of JST (Japan Science and Technology Corporation) and a Grant-in-Aid for Scientific Research (C) (No. 12640488) of the Japanese Ministry of Education, Science, Sports and Culture.
PY - 2003/3/14
Y1 - 2003/3/14
N2 - We made the first observation of transient vibrational spectra of both adsorbate and adsorbent at molecule-adsorbed surface using a two-color infrared picosecond laser system. The transient measurements were carried out on the CO-adsorbed surface hydroxyl group (OD) of DM-20 zeolite by pumping the CO stretching mode (2175 cm-1) or OD stretching mode (2470 cm-1) and probing over the CO and OD stretching region (2000-2700 cm-1). The T1 lifetime for OD was 5.8 ps and that for CO was 540 ps. By comparison with other CO-adsorbed systems, vibrational relaxation mechanisms of CO on various surfaces are discussed. We also found evidence of energy flows from the vibrational mode of the adsorbent (OD stretching) to that of the adsorbate (CO stretching) via van der Waals interaction.
AB - We made the first observation of transient vibrational spectra of both adsorbate and adsorbent at molecule-adsorbed surface using a two-color infrared picosecond laser system. The transient measurements were carried out on the CO-adsorbed surface hydroxyl group (OD) of DM-20 zeolite by pumping the CO stretching mode (2175 cm-1) or OD stretching mode (2470 cm-1) and probing over the CO and OD stretching region (2000-2700 cm-1). The T1 lifetime for OD was 5.8 ps and that for CO was 540 ps. By comparison with other CO-adsorbed systems, vibrational relaxation mechanisms of CO on various surfaces are discussed. We also found evidence of energy flows from the vibrational mode of the adsorbent (OD stretching) to that of the adsorbate (CO stretching) via van der Waals interaction.
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U2 - 10.1016/S0009-2614(03)00071-X
DO - 10.1016/S0009-2614(03)00071-X
M3 - Article
AN - SCOPUS:0037436812
SN - 0009-2614
VL - 370
SP - 437
EP - 442
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 3-4
ER -