Photoexcitation and Relaxation Processes in Polyacetylene
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概要
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The dynauatical r'esponse of' 21 Zr'o,n.s-jcol.5';tcet3'lene chaita after photoexcit;rtion 1.vyz tlae laser I)[1186xvhtch re,';outantl.)' excutes the loxvest cyclically ;tlloxx'ed excited (IU. ) state is inxvestigated trsing theParuser-Parr-Pojole anodel. The tizaae exzolvrtiota of' electrotaic ?tnd latttice strtrcttnres is catlcttlaxtedl.>y solving the tiutae-dejcetadetut H?trtree-Foci< ecjtrsttiota for 7T electrons and the Nexvtort's eqvrationof' raaotion for the l?tttice sitaatnlt?xtaeotrs1y. Tlne XB., excit;xtion redttces the lattice on'der partttaxeters(LOP's) ;tnd tlae signs of' the LOP's, except f'or strotrnd tlae erads of' tlae claatin, are rex'ersed at acertatin tiua?e xx'heta tlae ptrlse exterraatl field is strorag etaottgla. Tlae cla;tr?'tcteristic cla;trge clensit5z(CD) oscill;ttuorr iradtrced by the IB.. excit?ttion contintres trntil tl'ais tinae Ictrt strlaseqtrently tlaeoscill?xtion patterrn claanges drsxstic?t1l3 ' ?rrad ?t1.crtrjctl5z as 21 restrlt o['tlae I?tttice reI?txatioru. In severalranges of' the taaatgnittnde of' tlae externatJ field, Clue indtrced CD's Iocstlize arotund Clue zeros of' theLOP and 21 charged soliton pair is generstted. The collision betxveen tlae charged so[itons restmltsin forxtaation of the loreather. Tlue breatlaer dec;t)'s into a couaa)c[icated CD oscillation patterta, andthe chsxrged solitons dis;xppesxr l.cy getaainatte recoraal.cira?ttion. Tlae oTc{atined [if'e tiutae of' a cJaatrc'edsolitona is less tin;tn 250I's.b
- 1998-08-15
著者
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TAKAHASHI Akira
Department of Dermatology, School of Medicine, Fukuoka University
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Yamashiro Atsushi
Department Of Advanced Materials Science And Engineering Faculty Of Engineering Yamaguchi University
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Takahashi Akira
Department Of Advanced Materials Science And Engineering Faculty Of Engineering Yamaguchi University
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