FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W3121120996> ?p ?o ?g. }

• W3121120996 endingPage "489" @default.
• W3121120996 startingPage "481" @default.
• W3121120996 abstract "ConspectusDicarbon, the molecule formed from two carbon atoms, is among the most abundant molecules in the universe. Said by some to exhibit a quadruple bond, it is bound by more than 6 eV and supports a large number of valence electronic states. It thus has a rich spectroscopy, with 19 one-photon band systems, four of which were discovered by the author and co-workers. Its spectrum was among the first to be described: Wollaston reported the emission spectra from blue flames in 1802.C2 is observed in a variety of astronomical objects, including stars, circumstellar shells, nebulae, comets and the interstellar medium. It is responsible for the green color of cometary comae but is not observed in the comet tail. It can be observed in absorption and emission by optical spectroscopy in the infrared, visible, and ultraviolet regions of the spectrum, and because it has no electric-dipole-allowed vibrational or rotational transitions, its spectral signature is a sensitive probe of the local environment.Before the work described in this Account, models of C2 photophysics included the thitherto-unobserved c3Σu+ state and parametrized the strength of spin-forbidden intercombination transitions. Furthermore, they did not account for photodissociation of C2, even though it was identified in the 1930s as a key process. Inspired by the observation of C2 in the Red Rectangle nebula, the author was motivated to instill rigor into C2 models and embarked on a spectroscopic and computational journey that has lasted 15 years.We were the first to identify the c3Σu+ state through the d3Πg–c3Σu+ transitions, which were to become known as the “Duck” system. This minor partner to the well-known Swan bands is a key part of astrophysical C2 models and can now be included with rigor. We identified the e3Πg–c3Σu+ system, and the c3Σu+ state is now well-studied. Meanwhile others described the singlet–triplet and triplet–quintet interactions in exquisite detail, allowing rigorous modeling of the a–X and c–X intercombination transitions.The final piece of the C2 puzzle would be understanding how long it survives before being broken into carbon atom fragments. Though predicted by Herzberg, predissociation in the e3Πg state had never been observed. To find it would require the complicated ultraviolet spectroscopy of C2 to be disentangled. In so doing, we identified the 43Πg and 33Πg states of C2, thus uncovering two new band systems. The 43Πg state allowed the first accurate determination of the ionization energy of C2. With these new band systems secure, we extracted new levels of the D1Σu+ state (Mulliken bands) and the e3Πg state (Fox–Herzberg bands) from our spectra. Upon climbing the energy ladder in the e3Πg state to v = 12, we finally identified the route to predissociation of C2 via non-adiabatic coupling to the d3Πg state. This observation provided the first laboratory evidence for why C2 is observed in the coma of a comet but not the tail." @default.
• W3121120996 created "2021-01-18" @default.
• W3121120996 creator A5004046189 @default.
• W3121120996 date "2021-01-13" @default.
• W3121120996 modified "2023-10-17" @default.
• W3121120996 title "The Spectroscopy of C₂: A Cosmic Beacon" @default.
• W3121120996 cites W108323925 @default.
• W3121120996 cites W134163901 @default.
• W3121120996 cites W136258248 @default.
• W3121120996 cites W1674605560 @default.
• W3121120996 cites W1905854000 @default.
• W3121120996 cites W1967983871 @default.
• W3121120996 cites W1968658206 @default.
• W3121120996 cites W1971749283 @default.
• W3121120996 cites W1975490092 @default.
• W3121120996 cites W1981833741 @default.
• W3121120996 cites W1985014645 @default.
• W3121120996 cites W1987053941 @default.
• W3121120996 cites W1987260592 @default.
• W3121120996 cites W1987284181 @default.
• W3121120996 cites W1989971118 @default.
• W3121120996 cites W1990130411 @default.
• W3121120996 cites W1991020527 @default.
• W3121120996 cites W199690363 @default.
• W3121120996 cites W1997227464 @default.
• W3121120996 cites W1997673153 @default.
• W3121120996 cites W1998795812 @default.
• W3121120996 cites W1999240913 @default.
• W3121120996 cites W2000231346 @default.
• W3121120996 cites W2000945036 @default.
• W3121120996 cites W2002697494 @default.
• W3121120996 cites W2003433535 @default.
• W3121120996 cites W2012077169 @default.
• W3121120996 cites W2012949801 @default.
• W3121120996 cites W2037365376 @default.
• W3121120996 cites W2039097690 @default.
• W3121120996 cites W2040229847 @default.
• W3121120996 cites W2041513049 @default.
• W3121120996 cites W2044383017 @default.
• W3121120996 cites W2047737869 @default.
• W3121120996 cites W2049329105 @default.
• W3121120996 cites W2052863349 @default.
• W3121120996 cites W2056402643 @default.
• W3121120996 cites W2057498878 @default.
• W3121120996 cites W2069098450 @default.
• W3121120996 cites W2070149524 @default.
• W3121120996 cites W2072759649 @default.
• W3121120996 cites W2073590888 @default.
• W3121120996 cites W2086946768 @default.
• W3121120996 cites W2090770558 @default.
• W3121120996 cites W2094629124 @default.
• W3121120996 cites W2097337295 @default.
• W3121120996 cites W2113612168 @default.
• W3121120996 cites W2114341076 @default.
• W3121120996 cites W2115333646 @default.
• W3121120996 cites W2145389598 @default.
• W3121120996 cites W2158467290 @default.
• W3121120996 cites W2207940533 @default.
• W3121120996 cites W2307962017 @default.
• W3121120996 cites W2312491874 @default.
• W3121120996 cites W2317505061 @default.
• W3121120996 cites W2341639844 @default.
• W3121120996 cites W2397942015 @default.
• W3121120996 cites W2464675696 @default.
• W3121120996 cites W2509249276 @default.
• W3121120996 cites W2603185714 @default.
• W3121120996 cites W2604755847 @default.
• W3121120996 cites W2735466215 @default.
• W3121120996 cites W2764034839 @default.
• W3121120996 cites W2912380707 @default.
• W3121120996 cites W3103093227 @default.
• W3121120996 cites W3104362483 @default.
• W3121120996 cites W3150178279 @default.
• W3121120996 doi "https://doi.org/10.1021/acs.accounts.0c00703" @default.
• W3121120996 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33440124" @default.
• W3121120996 hasPublicationYear "2021" @default.
• W3121120996 type Work @default.
• W3121120996 sameAs 3121120996 @default.
• W3121120996 citedByCount "13" @default.
• W3121120996 countsByYear W31211209962021 @default.
• W3121120996 countsByYear W31211209962022 @default.
• W3121120996 countsByYear W31211209962023 @default.
• W3121120996 crossrefType "journal-article" @default.
• W3121120996 hasAuthorship W3121120996A5004046189 @default.
• W3121120996 hasConcept C119824511 @default.
• W3121120996 hasConcept C120665830 @default.
• W3121120996 hasConcept C121332964 @default.
• W3121120996 hasConcept C1276947 @default.
• W3121120996 hasConcept C150846664 @default.
• W3121120996 hasConcept C184779094 @default.
• W3121120996 hasConcept C185592680 @default.
• W3121120996 hasConcept C19329426 @default.
• W3121120996 hasConcept C196939603 @default.
• W3121120996 hasConcept C2779496878 @default.
• W3121120996 hasConcept C32891209 @default.
• W3121120996 hasConcept C44870925 @default.
• W3121120996 hasConcept C4839761 @default.
• W3121120996 hasConcept C54582936 @default.

• next