{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,7,30]],"date-time":"2025-07-30T11:19:15Z","timestamp":1753874355413,"version":"3.41.2"},"reference-count":34,"publisher":"AIP Publishing","issue":"7","funder":[{"DOI":"10.13039\/501100004837","name":"Ministerio de Ciencia e Innovaci\u00f3n","doi-asserted-by":"publisher","award":["PGC2018-096444-B-I00","PID2021-122839NB-I00"],"award-info":[{"award-number":["PGC2018-096444-B-I00","PID2021-122839NB-I00"]}],"id":[{"id":"10.13039\/501100004837","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100008433","name":"Consejer\u00eda de Educaci\u00f3n, Juventud y Deporte, Comunidad de Madrid","doi-asserted-by":"publisher","award":["Y2018\/NMT-5028 FULMATEN-CM"],"award-info":[{"award-number":["Y2018\/NMT-5028 FULMATEN-CM"]}],"id":[{"id":"10.13039\/501100008433","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002911","name":"Universidad Complutense de Madrid","doi-asserted-by":"publisher","award":["PR27\/21-010"],"award-info":[{"award-number":["PR27\/21-010"]}],"id":[{"id":"10.13039\/501100002911","id-type":"DOI","asserted-by":"publisher"}]},{"name":"SOLEIL","award":["2017047"],"award-info":[{"award-number":["2017047"]}]}],"content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2023,8,21]]},"abstract":"<jats:p>Multiphoton ionization (MPI) of alkyl iodides (RI, R = CnH2n+1, n = 1\u20134) has been investigated with femtosecond laser pulses centered at 800 and 400\u00a0nm along with photoelectron imaging detection. In addition, the ultraviolet (UV)\u2013vacuum ultraviolet (VUV) absorption spectra of gas-phase RIs have been measured in the photon energy range of 5\u201311\u00a0eV using the VUV Fourier transform spectrometer at the VUV DESIRS beamline of the synchrotron SOLEIL facility. The use of high-laser-field strengths in matter\u2013radiation interaction generates highly non-linear phenomena, such as the Stark shift effect, which distorts the potential energy surfaces of molecules by varying both the energy of electronic and rovibrational states and their ionization energies. The Stark shift can then generate resonances between intermediate states and an integer number of laser photons of a given wavelength, which are commonly known as Freeman resonances. Here, we study how the molecular structure of linear and branched alkyl iodides affects the UV\u2013VUV absorption spectrum, the MPI process, and the generation of Freeman resonances. The obtained results reveal a dominant resonance in the experiments at 800\u00a0nm, which counter-intuitively appears at the same photoelectron kinetic energy in the whole alkyl iodide series. The ionization pathways of this resonance strongly involve the 6p(2E3\/2) Rydberg state with different degrees of vibrational excitation, revealing an energy compensation effect as the R-chain complexity increases.<\/jats:p>","DOI":"10.1063\/5.0161628","type":"journal-article","created":{"date-parts":[[2023,8,15]],"date-time":"2023-08-15T11:35:04Z","timestamp":1692099304000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Stark control of multiphoton ionization through Freeman resonances in alkyl iodides"],"prefix":"10.1063","volume":"159","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-5430-6675","authenticated-orcid":false,"given":"Ignacio M.","family":"Casas\u00fas","sequence":"first","affiliation":[{"name":"Departamento de Qu\u00edmica F\u00edsica, Facultad de Ciencias Qu\u00edmicas, Universidad Complutense de Madrid 1 , 28040 Madrid, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1577-8731","authenticated-orcid":false,"given":"Mar\u00eda E.","family":"Corrales","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica F\u00edsica, Facultad de Ciencias Qu\u00edmicas, Universidad Complutense de Madrid 1 , 28040 Madrid, Spain"},{"name":"Departamento de Qu\u00edmica, Facultad de Ciencias, M\u00f3dulo 13, Facultad de Ciencias, Universidad Aut\u00f3noma de Madrid 2 , 28049 Madrid, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9681-349X","authenticated-orcid":false,"given":"Marta L.","family":"Murillo-S\u00e1nchez","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica F\u00edsica, Facultad de Ciencias Qu\u00edmicas, Universidad Complutense de Madrid 1 , 28040 Madrid, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6712-3628","authenticated-orcid":false,"given":"Sonia","family":"Marggi Poullain","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica F\u00edsica, Facultad de Ciencias Qu\u00edmicas, Universidad Complutense de Madrid 1 , 28040 Madrid, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7828-7206","authenticated-orcid":false,"given":"Nelson","family":"de Oliveira","sequence":"additional","affiliation":[{"name":"Synchrotron SOLEIL, L\u2019Orme des Merisiers 3 , 91192 Gif sur Yvette, France"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2696-1152","authenticated-orcid":false,"given":"Paulo","family":"Lim\u00e3o-Vieira","sequence":"additional","affiliation":[{"name":"Atomic and Molecular Collisions Laboratory, CEFITEC, Department of Physics, Universidade NOVA de Lisboa 4 , 2829-516 Caparica, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0777-2375","authenticated-orcid":false,"given":"Luis","family":"Ba\u00f1ares","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica F\u00edsica, Facultad de Ciencias Qu\u00edmicas, Universidad Complutense de Madrid 1 , 28040 Madrid, Spain"},{"name":"Instituto Madrile\u00f1o de Estudios Avanzados en Nanociencia (IMDEA-Nanoscience) 5 , Cantoblanco, 28049 Madrid, Spain"}]}],"member":"317","published-online":{"date-parts":[[2023,8,15]]},"reference":[{"key":"2023081511345688000_c1","doi-asserted-by":"publisher","first-page":"235602","DOI":"10.1088\/1361-6455\/aa8e67","volume":"50","year":"2017","journal-title":"J. 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