{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,1]],"date-time":"2026-06-01T17:29:07Z","timestamp":1780334947858,"version":"3.54.1"},"reference-count":4,"publisher":"AIP Publishing","issue":"9","funder":[{"DOI":"10.13039\/100008398","name":"Villum Fonden","doi-asserted-by":"publisher","award":["22956"],"award-info":[{"award-number":["22956"]}],"id":[{"id":"10.13039\/100008398","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100009708","name":"Novo Nordisk Fonden","doi-asserted-by":"publisher","award":["NNF18OC0032628"],"award-info":[{"award-number":["NNF18OC0032628"]}],"id":[{"id":"10.13039\/501100009708","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2021,9,1]]},"abstract":"<jats:p>We present a simple and inexpensive liquid surface height controller that can monitor and maintain the height of a liquid surface in a surface-sensitive experiment. The system is based on a commercial laser pointer, universal serial bus webcam, syringe pump, and homemade control software. The system can sense changes in the height of the surface of \u00b11 \u00b5m, and the maximum range of the device without readjustment is around 2.5\u00a0mm. The intended use of the device is to maintain the height of a sample at the air\u2013water interface in a sum-frequency generation spectroscopy measurement, which constantly changes due to water evaporation. A demonstration of the system maintaining the height of a water surface to a tolerance of \u00b15 \u00b5m over a period of 8 h is shown to illustrate the stability of a system controlled by this device.<\/jats:p>","DOI":"10.1063\/5.0057849","type":"journal-article","created":{"date-parts":[[2021,9,9]],"date-time":"2021-09-09T09:55:16Z","timestamp":1631181316000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":4,"title":["A liquid surface height controller for surface spectroscopy"],"prefix":"10.1063","volume":"92","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1303-7198","authenticated-orcid":false,"given":"James D.","family":"Pickering","sequence":"first","affiliation":[{"name":"Department of Chemistry, Aarhus University , Langelandsgade 140, 8000 Aarhus C, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3847-5936","authenticated-orcid":false,"given":"Adam S.","family":"Chatterley","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Aarhus University , Langelandsgade 140, 8000 Aarhus C, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5748-6783","authenticated-orcid":false,"given":"Mikkel","family":"Bregnh\u00f8j","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Aarhus University , Langelandsgade 140, 8000 Aarhus C, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7083-7004","authenticated-orcid":false,"given":"Tobias","family":"Weidner","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Aarhus University , Langelandsgade 140, 8000 Aarhus C, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2021,9,9]]},"reference":[{"key":"2023080705082293000_c1","doi-asserted-by":"publisher","first-page":"053106","DOI":"10.1063\/1.4982050","volume":"88","year":"2017","journal-title":"Rev. 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