{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T19:00:22Z","timestamp":1790881222326,"version":"4.1.0"},"reference-count":89,"publisher":"American Physical Society (APS)","issue":"1","license":[{"start":{"date-parts":[[2026,7,15]],"date-time":"2026-07-15T00:00:00Z","timestamp":1784073600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100020909","name":"Institut Laue-Langevin","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100020909","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["journals.aps.org"],"crossmark-restriction":true},"short-container-title":["Phys. Rev. E"],"accepted":{"date-parts":[[2026,6,18]]},"abstract":"<jats:p>\n                    Understanding the atomic-scale dynamics of liquids in the terahertz (THz) regime remains challenging because liquids sustain phonon-like collective excitations governed by complex interactions. To clarify the role of hydrogen bonding in such dynamics, we performed inelastic neutron scattering on hydrogen sulfide\n                    <a:math xmlns:a=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                      <a:mrow>\n                        <a:mo>(<\/a:mo>\n                        <a:msub>\n                          <a:mi mathvariant=\"normal\">H<\/a:mi>\n                          <a:mn>2<\/a:mn>\n                        <\/a:msub>\n                        <a:mi mathvariant=\"normal\">S<\/a:mi>\n                        <a:mo>)<\/a:mo>\n                      <\/a:mrow>\n                    <\/a:math>\n                    and its deuterated form\n                    <d:math xmlns:d=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                      <d:mrow>\n                        <d:mo>(<\/d:mo>\n                        <d:msub>\n                          <d:mi mathvariant=\"normal\">D<\/d:mi>\n                          <d:mn>2<\/d:mn>\n                        <\/d:msub>\n                        <d:mi mathvariant=\"normal\">S<\/d:mi>\n                        <d:mo>)<\/d:mo>\n                      <\/d:mrow>\n                    <\/d:math>\n                    , molecular analogues of water without a hydrogen-bonded network. By combining coherent and incoherent measurements, we show that liquid\n                    <g:math xmlns:g=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                      <g:mrow>\n                        <g:msub>\n                          <g:mi mathvariant=\"normal\">H<\/g:mi>\n                          <g:mn>2<\/g:mn>\n                        <\/g:msub>\n                        <g:mi mathvariant=\"normal\">S<\/g:mi>\n                      <\/g:mrow>\n                    <\/g:math>\n                    exhibits a clear fast-sound mode, with a propagation velocity about twice the adiabatic sound speed, as in water. In contrast to hydrogen-bonded liquids, which display a secondary, nearly momentum-independent mode at 6\u20137\u00a0meV, no corresponding feature is observed in liquid\n                    <j:math xmlns:j=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                      <j:mrow>\n                        <j:msub>\n                          <j:mi mathvariant=\"normal\">D<\/j:mi>\n                          <j:mn>2<\/j:mn>\n                        <\/j:msub>\n                        <j:mi mathvariant=\"normal\">S<\/j:mi>\n                      <\/j:mrow>\n                    <\/j:math>\n                    . This absence highlights the central role of hydrogen bonding in enabling additional low-energy excitations. Overall, while fast sound is not exclusive to hydrogen-bonded systems, the detailed vibrational spectrum is strongly shaped by the local bonding environment.\n                  <\/jats:p>","DOI":"10.1103\/ccq9-618c","type":"journal-article","created":{"date-parts":[[2026,6,18]],"date-time":"2026-06-18T16:08:08Z","timestamp":1781798888000},"update-policy":"https:\/\/doi.org\/10.1103\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["THz dynamics of hydrogen sulfide: Search for collective modes of a non-hydrogen-bonded analog of water"],"prefix":"10.1103","volume":"114","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5661-603X","authenticated-orcid":true,"given":"Ferdinando","family":"Formisano","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/00yfw2296","id-type":"ROR","asserted-by":"publisher"}],"name":"IOM"},{"id":[{"id":"https:\/\/ror.org\/01xtjs520","id-type":"ROR","asserted-by":"publisher"}],"name":"ILL"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4207-1996","authenticated-orcid":true,"given":"Alessio","family":"De 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