000631864 001__ 631864 000631864 005__ 20250626211013.0 000631864 0247_ $$2arXiv$$aarXiv:2502.16572 000631864 0247_ $$2datacite_doi$$a10.3204/PUBDB-2025-02061 000631864 037__ $$aPUBDB-2025-02061 000631864 041__ $$aEnglish 000631864 088__ $$2arXiv$$aarXiv:2502.16572 000631864 1001_ $$aMusic, Valerija$$b0 000631864 245__ $$aWavelength-Dependent Photodissociation of Iodomethylbutane 000631864 260__ $$c2025 000631864 3367_ $$0PUB:(DE-HGF)25$$2PUB:(DE-HGF)$$aPreprint$$bpreprint$$mpreprint$$s1750930283_1088284 000631864 3367_ $$2ORCID$$aWORKING_PAPER 000631864 3367_ $$028$$2EndNote$$aElectronic Article 000631864 3367_ $$2DRIVER$$apreprint 000631864 3367_ $$2BibTeX$$aARTICLE 000631864 3367_ $$2DataCite$$aOutput Types/Working Paper 000631864 500__ $$a12 pages, 9 figures 000631864 520__ $$aUltrashort XUV pulses of the Free-Electron-LASer in Hamburg (FLASH) were used to investigate laser-induced fragmentation patterns of the prototypical chiral molecule 1-iodo-2-methyl-butane (C$_5$H$_{11}$I) in a pump-probe scheme. Ion velocity-map images and mass spectra of optical-laser-induced fragmentation were obtained for subsequent FEL exposure with photon energies of 63 eV and 75 eV. These energies specifically address the iodine 4d edge of neutral and singly charged iodine, respectively. The presented ion spectra for two optical pump-laser wavelengths, i.e., 800 nm and 267 nm, reveal substantially different cationic fragment yields in dependence on the wavelength and intensity. For the case of 800-nm-initiated fragmentation, the molecule dissociates notably slower than for the 267-nm pump. 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