{"id":180999,"date":"2024-01-21T10:22:48","date_gmt":"2024-01-21T16:22:48","guid":{"rendered":"https:\/\/lifeboat.com\/blog\/2024\/01\/disentangling-the-confounding-spectroscopy-of-c1-molecules-without-symmetry-as-a-guide-everything-is-allowed"},"modified":"2024-01-21T10:22:48","modified_gmt":"2024-01-21T16:22:48","slug":"disentangling-the-confounding-spectroscopy-of-c1-molecules-without-symmetry-as-a-guide-everything-is-allowed","status":"publish","type":"post","link":"https:\/\/lifeboat.com\/blog\/2024\/01\/disentangling-the-confounding-spectroscopy-of-c1-molecules-without-symmetry-as-a-guide-everything-is-allowed","title":{"rendered":"Disentangling the confounding spectroscopy of C1 molecules: Without symmetry as a guide, everything is allowed"},"content":{"rendered":"<p style=\"padding-right: 20px\"><a class=\"aligncenter blog-photo\" href=\"https:\/\/lifeboat.com\/blog.images\/disentangling-the-confounding-spectroscopy-of-c1-molecules-without-symmetry-as-a-guide-everything-is-allowed2.jpg\"><\/a><\/p>\n<p>The spectra of C<sub>1<\/sub> molecules are confounding in that each of the fundamental vibrational modes transform as the same irreducible representation (A) and hence each band consists of a seemingly random distribution of a-, b-, and c-type transitions. This is in contrast to higher symmetry molecules for which band types are readily deduced by simple symmetry rules. Herein, we present a method to simulate the convoluted rotational contours in the gas-phase spectra of C<sub>1<\/sub> molecules by combining existing <em>ab initio<\/em> calculations with Colin Western\u2019s pgopher rotational contour program. Specifically, <em>ab initio<\/em> calculations in the NWC hem suite of programs were employed to predict the components of the dipole moment derivatives along the principal axes of the moments of inertia. This information was then input into pgopher to model the fundamental band contours as a sum of a-, b-, and c-type transitions. This method was applied to simulate the rotational contour spectra of a series of representative C<sub>1<\/sub> molecules which were then compared against both <em>ab initio<\/em> stick spectra and experimentally measured broadband IR spectra from the Pacific Northwest National Laboratory infrared gas-phase database. In addition to providing further insight beyond what is revealed in a typical stick spectrum, the simulated contours showed good agreement with the measured spectra.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The spectra of C1 molecules are confounding in that each of the fundamental vibrational modes transform as the same irreducible representation (A) and hence each band consists of a seemingly random distribution of a-, b-, and c-type transitions. This is in contrast to higher symmetry molecules for which band types are readily deduced by simple [\u2026]<\/p>\n","protected":false},"author":661,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20],"tags":[],"class_list":["post-180999","post","type-post","status-publish","format-standard","hentry","category-futurism"],"_links":{"self":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/180999","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/users\/661"}],"replies":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/comments?post=180999"}],"version-history":[{"count":0,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/180999\/revisions"}],"wp:attachment":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/media?parent=180999"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/categories?post=180999"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/tags?post=180999"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}