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[分子科学会速報14-090]  Sears博士講演会 7月30日(水)@東大本郷
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速報発信者:小林かおり(冨山大学大学院理工学研究部(理学))


Sears博士講演会 7月30日(水)@東大本郷

メーリングリストの皆様:重複して受け取られる方もいらっしゃると思いま
すが、お許しください。

このたびブルックヘブン国立研究所/ニューヨーク州立大学ストーニーブルッ
ク校のSears博士によるセミナーを開催致します。多数の方のご来聴をお待ち
致しております。

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日時:2014年7月30日(水)15:00〜16:00
場所:東京大学 理学部1号館414号室
http://www.s.u-tokyo.ac.jp/ja/map/map02.html
http://www.s.u-tokyo.ac.jp/en/map/map02.html

講演者:
Dr. Trevor J. Sears
(Brookhaven National Laboratory/Stony Brook University)

講演タイトル:
SPECTROSCOPIC AND DYNAMICAL STUDIES OF SMALL FREE RADICALS AND 
MOLECULES

概要:
 New laser-based spectroscopic techniques permit one to address long-
standing problems involving collisional processes in gases with 
unprecidented precision and accuracy. This talk covers some recent 
work on the measurement of state-to-state processes in methylene 
(CH2) and cyanogen (CN) radicals by high resolution laser absorption 
spectroscopy in the near infrared. A complementary, more global, view
 of the consequences of collisions is available from precision line 
shape measurements and some have been completed for both CN and C2H2 
and new frequency comb referenced measurements will also be
 described.
 In CH2, collisional intersystem crossing (CISC) between the low-
lying singlet excited electronic state and the ground, less 
chemcially reactive, triplet state is mediated by a few rotational
 levels that possess mixed electronic state character as a result of
 their similar energies and the weak spin-orbit coupling in the 
radical. This picture of CISC in methylene is supported by studies of
 the rates of loss of population from the zero point level of the ~a
 1A1 state, but new measurements of the v2 = 1 level seem to 
contradict the model predictions.
 Collisional rotational energy transfer (RET) in CN collisions with 
He and Ar provide a model system that is more amenable to first 
principles calculations. Probing a single rotational, or even
 hyperne, level of the ground X state of CN, we have measured the RET
 rates for a number of levels for different collsion partners at a 
variety of pressures to compare to recent calculations. In addition, 
global line shape measurements have been made for CN and, in separate
 experiments, C2H2 and the results analyzed in terms of several 
speed-dependent line shape models. Signal-to-noise ratios of up to
 10^5 have been achieved in some of the C2H2 measurements and these
 provide very stringent tests of line shape models and can be used to
 assess the validity of physical descriptions such as speed-dependent
 and Dicke narrowing effects.

Acknowledgments: Work at Brookhaven National Laboratory was carried o
ut under Contract No. DE-AC02-98CH10886 with the U.S. Department of E
nergy and supported by its Office of Basic Energy Sciences, Division 
of Chemical Sciences, Geosciences and Biosciences.

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問い合わせ先:富山大学 大学院理工学研究部(理学)
小林 かおり
kaori@sci.u-toyama.ac.jp


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