{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T03:34:09Z","timestamp":1791084849016,"version":"4.1.0"},"reference-count":43,"publisher":"AIP Publishing","issue":"22","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2014,6,14]]},"abstract":"<jats:p>Rotational excitation of the hydrogen cyanide (HCN) molecule by collisions with para-H2(\u2009j = 0,\u20092) and ortho-H2(\u2009j = 1) is investigated at low temperatures using a quantum time independent approach. Both molecules are treated as rigid rotors. The scattering calculations are based on a highly correlated ab initio 4-dimensional (4D) potential energy surface recently published. Rotationally inelastic cross sections among the 13 first rotational levels of HCN were obtained using a pure quantum close coupling approach for total energies up to 1200 cm\u22121. The corresponding thermal rate coefficients were computed for temperatures ranging from 5 to 100 K. The HCN rate coefficients are strongly dependent on the rotational level of the H2 molecule. In particular, the rate coefficients for collisions with para-H2(\u2009j = 0) are significantly lower than those for collisions with ortho-H2(\u2009j = 1) and para-H2(\u2009j = 2). Propensity rules in favor of even \u0394j transitions were found for HCN in collisions with para-H2(\u2009j = 0) whereas propensity rules in favor of odd \u0394j transitions were found for HCN in collisions with H2(\u2009j \u2a7e 1). The new rate coefficients were compared with previously published HCN-para-H2(\u2009j = 0) rate coefficients. Significant differences were found due the inclusion of the H2 rotational structure in the scattering calculations. These new rate coefficients will be crucial to improve the estimation of the HCN abundance in the interstellar medium.<\/jats:p>","DOI":"10.1063\/1.4880499","type":"journal-article","created":{"date-parts":[[2014,6,10]],"date-time":"2014-06-10T00:30:30Z","timestamp":1402360230000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":40,"title":["Rotational excitation of HCN by para- and ortho-H2"],"prefix":"10.1063","volume":"140","author":[{"given":"Mario Hern\u00e1ndez","family":"Vera","sequence":"first","affiliation":[{"name":"CNRS-Universit\u00e9 du Havre 1 LOMC - UMR 6294, , 25 rue Philippe Lebon, BP 1123, 76 063 Le Havre cedex, France"},{"name":"Quinta de Los Molinos 2 InSTEC, , Plaza, La Habana 10600, Cuba"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yulia","family":"Kalugina","sequence":"additional","affiliation":[{"name":"CNRS-Universit\u00e9 du Havre 1 LOMC - UMR 6294, , 25 rue Philippe Lebon, BP 1123, 76 063 Le Havre cedex, France"},{"name":"Tomsk State University 3 , 36 Lenin av., Tomsk 634050, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Otoniel","family":"Denis-Alpizar","sequence":"additional","affiliation":[{"name":"Universit\u00e9 de Bordeaux 4 , ISM, CNRS UMR 5255, 33405 Talence Cedex, France"},{"name":"Universidad de Matanzas 5 Departamento de F\u00edsica, , Matanzas 40100, Cuba"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thierry","family":"Stoecklin","sequence":"additional","affiliation":[{"name":"Universit\u00e9 de Bordeaux 4 , ISM, CNRS UMR 5255, 33405 Talence Cedex, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fran\u00e7ois","family":"Lique","sequence":"additional","affiliation":[{"name":"CNRS-Universit\u00e9 du Havre 1 LOMC - UMR 6294, , 25 rue Philippe Lebon, BP 1123, 76 063 Le Havre cedex, France"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2014,6,9]]},"reference":[{"key":"2023070323382902700_c1","doi-asserted-by":"publisher","first-page":"84","DOI":"10.1016\/j.molliq.2006.03.021","volume":"127","year":"2006","journal-title":"J. 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