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The one-color resonance-enhanced multiphoton ionization process used allows ionizing selectively the different conformers present in the supersonic expansion by selecting their S0-S1 transition. We first describe the experimental setup with emphasis on the data acquisition and processing. Then, we apply this ionization scheme to a flexible molecule, 1,2,3,4-tetrahydro-3-isoquinoline methanol (THIQM). This molecule shows two stereogenic centers, namely, an asymmetric carbon and a nitrogen atom. It exists in two conformers, THIQMI and THIQMII, which differ by the direction of the intramolecular hydrogen bond and the absolute configuration of the nitrogen atom. Therefore, these two conformers are also diastereomers, endowed with slightly different ionization energies. The ionization energy of THIQMI, which shows an OH\u2026N hydrogen bond, is slightly higher than that of THIQMII. Their PECD spectra, although of identical signs, differ in shape and magnitude. Surprisingly, the anisotropy parameter is more sensitive than the PECD to the conformational isomerism at play in this system.<\/jats:p>","DOI":"10.1063\/4.0000776","type":"journal-article","created":{"date-parts":[[2025,11,7]],"date-time":"2025-11-07T15:46:47Z","timestamp":1762530407000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":5,"title":["Conformer-selective photoelectron circular dichroism: Experimental development and application to nitrogen chirality"],"prefix":"10.1063","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-5772-8545","authenticated-orcid":false,"given":"Etienne","family":"Rouquet","sequence":"first","affiliation":[{"name":"Institut des Sciences Mol\u00e9culaires d'Orsay (ISMO), CNRS, Universit\u00e9 Paris-Saclay 1 , F-91405 Orsay,","place":["France"]},{"name":"Synchrotron Soleil, L'Orme des Merisiers 2 , St. Aubin BP48, F-91192 Gif sur Yvette,","place":["France"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-0141-2384","authenticated-orcid":false,"given":"Julien","family":"Vincent","sequence":"additional","affiliation":[{"name":"Institut des Sciences Mol\u00e9culaires d'Orsay (ISMO), CNRS, Universit\u00e9 Paris-Saclay 1 , F-91405 Orsay,","place":["France"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5955-4372","authenticated-orcid":false,"given":"Val\u00e9ria","family":"Lep\u00e8re","sequence":"additional","affiliation":[{"name":"Institut des Sciences Mol\u00e9culaires d'Orsay (ISMO), CNRS, Universit\u00e9 Paris-Saclay 1 , F-91405 Orsay,","place":["France"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7131-968X","authenticated-orcid":false,"given":"Lionel","family":"Poisson","sequence":"additional","affiliation":[{"name":"Institut des Sciences Mol\u00e9culaires d'Orsay (ISMO), CNRS, Universit\u00e9 Paris-Saclay 1 , F-91405 Orsay,","place":["France"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5540-0667","authenticated-orcid":false,"given":"Anne","family":"Zehnacker","sequence":"additional","affiliation":[{"name":"Institut des Sciences Mol\u00e9culaires d'Orsay (ISMO), CNRS, Universit\u00e9 Paris-Saclay 1 , F-91405 Orsay,","place":["France"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2025,11,7]]},"reference":[{"issue":"23","key":"2025110710464183100_c1","doi-asserted-by":"publisher","first-page":"3351","DOI":"10.1002\/ejoc.202000406","article-title":"Introducing chirality at phosphorus atoms: An update on the recent synthetic strategies for the preparation of optically pure P-stereogenic molecules","volume":"2020","journal-title":"Eur. 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