LEADER 03135nam 2200457 450 001 996418436803316 005 20210216130141.0 010 $a3-030-54851-1 024 7 $a10.1007/978-3-030-54851-3 035 $a(CKB)4100000011435701 035 $a(DE-He213)978-3-030-54851-3 035 $a(MiAaPQ)EBC6348293 035 $a(PPN)250221527 035 $a(EXLCZ)994100000011435701 100 $a20210216d2020 uy 0 101 0 $aeng 135 $aurnn|008mamaa 181 $ctxt$2rdacontent 182 $cc$2rdamedia 183 $acr$2rdacarrier 200 10$aChemistry in action $emaking molecular movies with ultrafast electron diffraction and data science /$fLai Chung Liu 205 $a1st ed. 2020. 210 1$aCham, Switzerland :$cSpringer,$d[2020] 210 4$dİ2020 215 $a1 online resource (XX, 239 p. 110 illus., 106 illus. in color.) 225 1 $aSpringer Theses, Recognizing Outstanding Ph.D. Research,$x2190-5053 311 $a3-030-54850-3 327 $aChapter1: Introduction -- Chapter2: Methods: Experimental Techniques and Data Science -- Chapter3: Ultrafast Structural Dynamics of (EDO-TTF)2X -- Chapter4: Photocyclization Dynamics of Diarylethene -- Chapter5: Photoinduced Spin Crossover in Iron(II) Systems -- Chapter6: Future Work -- Chapter7: Conclusion. 330 $aThe thesis provides the necessary experimental and analytical tools to unambiguously observe the atomically resolved chemical reactions. A great challenge of modern science has been to directly observe atomic motions during structural transitions, and while this was first achieved through a major advance in electron source brightness, the information content was still limited and new methods for image reconstruction using femtosecond electron diffraction methods were needed. One particular challenge lay in reconciling the innumerable possible nuclear configurations with the observation of chemical reaction mechanisms that reproducibly give the same kind of chemistry for large classes of molecules. The author shows that there is a simple solution that occurs during barrier crossing in which the highly anharmonic potential at that point in nuclear rearrangements couples high- and low-frequency vibrational modes to give highly localized nuclear motions, reducing hundreds of potential degrees of freedom to just a few key modes. Specific examples are given in this thesis, including two photoinduced phase transitions in an organic system, a ring closure reaction, and two direct observations of nuclear reorganization driven by spin transitions. The emerging field of structural dynamics promises to change the way we think about the physics of chemistry and this thesis provides tools to make it happen. 410 0$aSpringer Theses, Recognizing Outstanding Ph.D. Research,$x2190-5053 606 $aStereochemistry 615 0$aStereochemistry. 676 $a541.223 700 $aLiu$b Lai Chung$0841964 801 0$bMiAaPQ 801 1$bMiAaPQ 801 2$bMiAaPQ 906 $aBOOK 912 $a996418436803316 996 $aChemistry in action$92057019 997 $aUNISA