{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T14:59:56Z","timestamp":1791385196205,"version":"4.3.3"},"reference-count":29,"publisher":"American Chemical Society (ACS)","issue":"10","license":[{"start":{"date-parts":[[2026,9,7]],"date-time":"2026-09-07T00:00:00Z","timestamp":1788739200000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-029"},{"start":{"date-parts":[[2026,9,7]],"date-time":"2026-09-07T00:00:00Z","timestamp":1788739200000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-037"},{"start":{"date-parts":[[2026,9,7]],"date-time":"2026-09-07T00:00:00Z","timestamp":1788739200000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-045"}],"funder":[{"DOI":"10.13039\/501100001665","name":"Agence Nationale de la Recherche","doi-asserted-by":"publisher","award":["17-CE29-001301"],"award-info":[{"award-number":["17-CE29-001301"]}],"id":[{"id":"10.13039\/501100001665","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002661","name":"Fonds De La Recherche Scientifique - FNRS","doi-asserted-by":"publisher","award":["T.0095.22"],"award-info":[{"award-number":["T.0095.22"]}],"id":[{"id":"10.13039\/501100002661","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Fonds pour la Recherche Industrielle et Agricole"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,10,7]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Understanding and quantifying activation parameters associated with the gas-phase isomerization kinetics of stereoisomeric ions, such as Z- and E-azobenzene ions, remains a key challenge in modern mass spectrometry. Here, we explore collisional activation as a fast and efficient method to probe isomerization kinetics on QToF instruments equipped with traveling wave-ion mobility spectrometry (TWIMS), such as the Waters Synapt platform. Using sequence-defined peptoids bearing an azobenzene chromophore, we investigate the collision-induced isomerization (CII) of Z-isomer ions into stable E-isomer ions within the Trap Cell\u2013IMS configuration. The extent of Z \u2192 E conversion is monitored as a function of the activation voltage (Trap CV), allowing the extraction of kinetic constants based on the known residence time of ions in the Trap Cell. By integrating previously determined gas-phase activation parameters (\u0394H\u2021 and \u0394S\u2021) into a modified Eyring framework, we derived effective temperatures (Teff) that characterize the internal energy distribution of activated ions. The dependence of Teff on Trap CV yields two critical parameters: \u03b1, describing the kinetic-to-internal energy conversion efficiency, and T0, the pre-activation ion population temperature. The measured \u03b1 values are of the same order as those previously derived for protein ions. However, T0 values are found to be system-dependent, which is detrimental for establishing a universal temperature calibration. Ongoing work focuses on expanding the switchable molecule library to map \u03b1 and T0 across diverse molecular architectures and decipher at the molecular level the origin of these two parameters.<\/jats:p>","DOI":"10.1021\/jasms.6c00196","type":"journal-article","created":{"date-parts":[[2026,9,8]],"date-time":"2026-09-08T04:23:37Z","timestamp":1788841417000},"page":"2432-2441","source":"Crossref","is-referenced-by-count":0,"title":["Kinetics of Collision-Induced\nBack-Isomerization of\nPhotoisomer Ions"],"prefix":"10.1021","volume":"37","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-0143-1358","authenticated-orcid":true,"given":"Thomas","family":"Robert","sequence":"first","affiliation":[{"name":"University of Mons, UMONS , , ,","place":["Mons, Belgium, B-7000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gwendal","family":"Henrard","sequence":"additional","affiliation":[{"name":"University of Mons, UMONS , , ,","place":["Mons, Belgium, B-7000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Benjamin","family":"Tassignon","sequence":"additional","affiliation":[{"name":"University of Mons, UMONS , , ,","place":["Mons, Belgium, B-7000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9067-7917","authenticated-orcid":true,"given":"Quentin","family":"Duez","sequence":"additional","affiliation":[{"name":"University of Mons, UMONS , , ,","place":["Mons, Belgium, B-7000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3429-5911","authenticated-orcid":true,"given":"Julien","family":"De Winter","sequence":"additional","affiliation":[{"name":"University of Mons, UMONS , , ,","place":["Mons, Belgium, B-7000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4395-1140","authenticated-orcid":true,"given":"Philippe","family":"Dugourd","sequence":"additional","affiliation":[{"name":"Universite\u0301 Claude Bernard Lyon 1, CNRS, Institut Lumie\u0300re Matie\u0300re , ,","place":["Villeurbanne, France, F-69622"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9115-9233","authenticated-orcid":true,"given":"Fabien","family":"Chirot","sequence":"additional","affiliation":[{"name":"Universite\u0301 Claude Bernard Lyon 1, CNRS, Institut Lumie\u0300re Matie\u0300re , ,","place":["Villeurbanne, France, F-69622"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5114-4352","authenticated-orcid":true,"given":"Pascal","family":"Gerbaux","sequence":"additional","affiliation":[{"name":"University of Mons, UMONS , , ,","place":["Mons, Belgium, B-7000"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,7]]},"reference":[{"issue":"6","key":"2026100710071483200_cit1","doi-asserted-by":"publisher","first-page":"599","DOI":"10.1016\/1044-0305(92)85001-Z","article-title":"Principles\nof Collisional Activation in Analytical Mass Spectrometry","volume":"3","author":"McLuckey","year":"1992","journal-title":"J. Am. Soc. Mass Spectrom."},{"issue":"42","key":"2026100710071483200_cit2","doi-asserted-by":"publisher","first-page":"8001","DOI":"10.1002\/anie.200702161","article-title":"Ion Mobility\u2013Mass\nSpectrometry Reveals Long-Lived,\nUnfolded Intermediates in the Dissociation of Protein Complexes","volume":"46","author":"Ruotolo","year":"2007","journal-title":"Angew. Chem. Int. Ed."},{"key":"2026100710071483200_cit3","doi-asserted-by":"publisher","first-page":"93","DOI":"10.1016\/j.cbpa.2017.11.010","article-title":"Collision\nInduced Unfolding of Isolated\nProteins in the Gas Phase: Past, Present, and Future","volume":"42","author":"Dixit","year":"2018","journal-title":"Curr. Opin. Chem. Biol."},{"issue":"3","key":"2026100710071483200_cit4","doi-asserted-by":"publisher","first-page":"602","DOI":"10.1021\/jasms.9b00055","article-title":"Rapid Determination\nof Activation\nEnergies for Gas-Phase Protein Unfolding and Dissociation in a Q-IM-ToF\nMass Spectrometer","volume":"31","author":"Donor","year":"2020","journal-title":"J. Am. Soc. Mass Spectrom."},{"issue":"12","key":"2026100710071483200_cit5","doi-asserted-by":"publisher","first-page":"1457","DOI":"10.1016\/j.tetlet.2015.01.187","article-title":"Designing Photoswitches for Molecular\nSolar Thermal Energy Storage","volume":"56","author":"Lennartson","year":"2015","journal-title":"Tetrahedron Lett."},{"issue":"11","key":"2026100710071483200_cit6","doi-asserted-by":"publisher","first-page":"4449","DOI":"10.1039\/c1ee01861b","article-title":"Chemical Solutions\nfor the Closed-Cycle Storage of Solar Energy","volume":"4","author":"Kucharski","year":"2011","journal-title":"Energy Environ. Sci."},{"issue":"6","key":"2026100710071483200_cit7","doi-asserted-by":"publisher","first-page":"585","DOI":"10.1021\/sc300107z","article-title":"Efficiency Limit of Molecular Solar\nThermal Energy Collecting Devices","volume":"1","author":"Bo\u0308rjesson","year":"2013","journal-title":"ACS Sustainable\nChem. Eng."},{"issue":"5","key":"2026100710071483200_cit8","doi-asserted-by":"publisher","first-page":"1809","DOI":"10.1039\/C1CS15179G","article-title":"Photoisomerization in Different Classes of Azobenzene","volume":"41","author":"Bandara","year":"2012","journal-title":"Chem. Soc. Rev."},{"issue":"7660","key":"2026100710071483200_cit9","doi-asserted-by":"publisher","first-page":"632","DOI":"10.1038\/nature22987","article-title":"Making Waves in\na Photoactive Polymer Film","volume":"546","author":"Gelebart","year":"2017","journal-title":"Nature"},{"issue":"32","key":"2026100710071483200_cit10","doi-asserted-by":"publisher","first-page":"7726","DOI":"10.1002\/chem.201900796","article-title":"Picosecond Switchable Azo Dyes","volume":"25","author":"Garcia-Amoro\u0301s","year":"2019","journal-title":"Chem.\u2500Eur. J."},{"issue":"3","key":"2026100710071483200_cit11","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202415614","article-title":"A Urease-Based PH Photoswitch: A\nGeneral Route to Light-to-pH Transduction","volume":"64","author":"Ivanov","year":"2025","journal-title":"Angew.\nChem. Int. Ed."},{"issue":"17","key":"2026100710071483200_cit12","doi-asserted-by":"publisher","first-page":"9405","DOI":"10.1021\/acs.analchem.5c00560","article-title":"Back Isomerization\nKinetics of Molecular Photoswitches: Complementary Insights from Liquid\nChromatography and Ion Mobility Measurements","volume":"97","author":"Robert","year":"2025","journal-title":"Anal. Chem."},{"issue":"9","key":"2026100710071483200_cit13","doi-asserted-by":"publisher","first-page":"094101","DOI":"10.1063\/1.4930604","article-title":"Tandem Ion Mobility Spectrometry Coupled to Laser Excitation","volume":"86","author":"Simon","year":"2015","journal-title":"Rev. Sci. Instrum."},{"issue":"9","key":"2026100710071483200_cit14","doi-asserted-by":"publisher","first-page":"4183","DOI":"10.1021\/acs.analchem.0c04520","article-title":"Exploring Conformational\nLandscapes Using Trap and Release Tandem Ion Mobility Spectrometry","volume":"93","author":"Le Fe\u0300vre","year":"2021","journal-title":"Anal. Chem."},{"issue":"46","key":"2026100710071483200_cit15","doi-asserted-by":"publisher","first-page":"10882","DOI":"10.1021\/acs.jpclett.2c02838","article-title":"Solving the Azobenzene\nEntropy Puzzle: Direct Evidence for Multi-State Reactivity","volume":"13","author":"Reimann","year":"2022","journal-title":"J. Phys. Chem. Lett"},{"key":"2026100710071483200_cit16","doi-asserted-by":"publisher","first-page":"233","DOI":"10.1007\/3-540-36113-8_7","article-title":"Threshold\nCollision-Induced Dissociations for the Determination of Accurate\nGas-Phase Binding Energies and Reaction Barriers","volume":"225","author":"Armentrout","year":"2003","journal-title":"Top. Curr. Chem."},{"issue":"15","key":"2026100710071483200_cit17","doi-asserted-by":"publisher","first-page":"2664","DOI":"10.1021\/j100238a003","article-title":"Current Status of Transition-State\nTheory","volume":"87","author":"Truhlar","year":"1983","journal-title":"J. Phys. Chem."},{"issue":"14","key":"2026100710071483200_cit18","doi-asserted-by":"publisher","first-page":"4097","DOI":"10.1039\/C9SC00644C","article-title":"Experimental\nand Theoretical Investigation\nof Overall Energy Deposition in Surface-Induced Unfolding of Protein\nIons","volume":"10","author":"Donor","year":"2019","journal-title":"Chem. Sci."},{"issue":"26","key":"2026100710071483200_cit19","doi-asserted-by":"publisher","first-page":"10646","DOI":"10.1021\/ja00052a076","article-title":"Efficient Method\nfor the Preparation of Peptoids [Oligo(N-Substituted Glycines)] by\nSubmonomer Solid-Phase Synthesis","volume":"114","author":"Zuckermann","year":"1992","journal-title":"J. Am. Chem.\nSoc."},{"issue":"70","key":"2026100710071483200_cit20","doi-asserted-by":"publisher","DOI":"10.1002\/chem.202303168","article-title":"Site Selectivity of Peptoids as Azobenzene Scaffold\nfor Molecular Solar Thermal Energy Storage","volume":"29","author":"Tassignon","year":"2023","journal-title":"Chem. A Eur. J."},{"issue":"3","key":"2026100710071483200_cit21","doi-asserted-by":"publisher","first-page":"553","DOI":"10.1007\/s13361-011-0313-7","article-title":"How Hot Are Your Ions in TWAVE Ion\nMobility Spectrometry?","volume":"23","author":"Merenbloom","year":"2012","journal-title":"J. Am. Soc. Mass Spectrom."},{"issue":"47","key":"2026100710071483200_cit22","doi-asserted-by":"publisher","first-page":"217","DOI":"10.1016\/j.ijms.2018.10.032","article-title":"Side-Chain Loss Reactions of Collisionally Activated\nProtonated Peptoids: A Mechanistic Insight","volume":"435","author":"Halin","year":"2019","journal-title":"Int. J. Mass Spectrom."},{"issue":"12","key":"2026100710071483200_cit23","doi-asserted-by":"publisher","first-page":"2726","DOI":"10.1007\/s13361-019-02342-z","article-title":"Backbone Cleavages of Protonated\nPeptoids upon Collision-Induced Dissociation: Competitive and Consecutive\nB-Y and A1-YX Reactions","volume":"30","author":"Halin","year":"2019","journal-title":"J. Am. Soc. Mass Spectrom."},{"key":"2026100710071483200_cit24","article-title":"Algorithms for Minimization Without Derivatives","author":"Brent","year":"1973","journal-title":"Algorithms Minimization Without Derivatives"},{"key":"2026100710071483200_cit25","doi-asserted-by":"publisher","first-page":"117290","DOI":"10.1016\/j.ijms.2024.117290","article-title":"Modeling\nCollisional Kinetic Energy Damping, Heating, and Cooling of Ions in\nMass Spectrometers: A Tutorial Perspective","volume":"504","author":"Prell","year":"2024","journal-title":"Int. J. Mass Spectrom."},{"issue":"12","key":"2026100710071483200_cit26","doi-asserted-by":"publisher","first-page":"1348","DOI":"10.1016\/j.jasms.2003.08.012","article-title":"A Model for Energy Transfer in Inelastic Molecular\nCollisions Applicable at Steady State or Non-Steady State and for\nan Arbitrary Distribution of Collision Energies","volume":"14","author":"Plass","year":"2003","journal-title":"J. Am. Soc. Mass Spectrom."},{"key":"2026100710071483200_cit27","volume-title":"Theory of Unimolecular\nand Recombination Reactions","author":"Gilbert","year":"1990"},{"issue":"9","key":"2026100710071483200_cit28","doi-asserted-by":"publisher","first-page":"1876","DOI":"10.1007\/s13361-017-1693-0","article-title":"How Hot\nAre Your Ions Really? A Threshold Collision-Induced Dissociation Study\nof Substituted Benzylpyridinium \u201cThermometer\u201d Ions","volume":"28","author":"Carpenter","year":"2017","journal-title":"J. Am. Soc. Mass Spectrom."},{"issue":"25","key":"2026100710071483200_cit29","doi-asserted-by":"publisher","first-page":"11005","DOI":"10.1039\/D6TC00861E","article-title":"On the Photo and Back\nIsomerization\nof Phenylazothiazoles Anchored onto Peptoids: One Step Further toward\nVisible-Light Photoswitches for Solar Energy Harnessing","volume":"14","author":"Henrard","year":"2026","journal-title":"J. Mater. Chem. C"}],"container-title":["Journal of the American\nSociety for Mass Spectrometry"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/pubs.acs.org\/doi\/pdf\/10.1021\/jasms.6c00196","content-type":"application\/pdf","content-version":"vor","intended-application":"unspecified"},{"URL":"https:\/\/pubs.acs.org\/jamsef\/article-pdf\/37\/10\/2432\/68436211\/jasms.6c00196.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/pubs.acs.org\/jamsef\/article-pdf\/37\/10\/2432\/68436211\/jasms.6c00196.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T14:31:34Z","timestamp":1791383494000},"score":1,"resource":{"primary":{"URL":"https:\/\/pubs.acs.org\/jamsef\/article\/37\/10\/2432\/5425722\/Kinetics-of-Collision-Induced-Back-Isomerization"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,9,7]]},"references-count":29,"journal-issue":{"issue":"10","published-online":{"date-parts":[[2026,9,7]]},"published-print":{"date-parts":[[2026,10,7]]}},"URL":"https:\/\/doi.org\/10.1021\/jasms.6c00196","relation":{},"ISSN":["1044-0305","1879-1123"],"issn-type":[{"value":"1044-0305","type":"print"},{"value":"1879-1123","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,9,7]]}}}