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A combined theoreti...
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Palmer, Michael H.Univ Edinburgh, Sch Chem, Joseph Black Bldg,David Brewster Rd, Edinburgh EH9 3FJ, Midlothian, Scotland.
(författare)
A combined theoretical and experimental study of the valence and Rydberg states of iodopentafluorobenzene
- Artikel/kapitelEngelska2017
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AMER INST PHYSICS,2017
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LIBRIS-ID:oai:DiVA.org:uu-323029
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-323029URI
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https://doi.org/10.1063/1.4981919DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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A new ultraviolet (UV) and vacuum ultraviolet (VUV) spectrum for iodopentafluorobenzene (C6F5I) using synchrotron radiation is reported. The measurements have been combined with those from a recent high-resolution photoelectron spectroscopic study. A major theoretical study, which includes both Franck-Condon (FC) and Herzberg-Teller (HT) analyses, leads to conclusions, which are compatible with both experimental studies. Our observation that the VUV multiplet at 7.926 eV in the VUV spectrum is a Rydberg state rather than a valence state leads to a fundamental reassignment of the VUV Rydberg spectrum over previous studies and removes an anomaly where some previously assigned Rydberg states were to optically forbidden states. Adiabatic excitation energies (AEEs) were determined from equations-of-motion coupled cluster with singles and doubles excitation; these were combined with time dependent density functional theoretical methods. Frequencies from these two methods are very similar, and this enabled the evaluation of both FC and HT contributions in the lower valence states. Multi-reference multi-root configuration interaction gave a satisfactory account of the principal UV+ VUV spectral profile of C6F5I, with vertical band positions and intensities. The UV spectral onset consists of two very weak transitions assigned to 1(1)B(1) (pi sigma*) and 1(1)B(2) (sigma sigma*) symmetries. The lowest unoccupied molecular orbital of a sigma*(a(1)) symmetry has a significant C-I* antibonding character. This results in considerable lengthening of the C-I bond for both these excited states. The vibrational intensity of the lowest 11B1 state is dominated by HT contributions; the 1(1)B(2) state contains both HT and FC contributions; the third band, which contains three states, two pi pi*(1(1)A(1), 2(1)B(2)) and one pi sigma*(2(1)B(1)), is dominated by FC contributions in the (1)A(1) state. In this (1)A(1) state, and the spectrally dominant bands near 6.7 ((1)A(1)) and 7.3 eV ((1)A(1) + B-1(2)), the C-I bond length is in the normal range, and FC components dominate.
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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Hoffmann, Soren VronningAarhus Univ, Dept Phys & Astron, ISA, Ny Munkegade 120, DK-8000 Aarhus C, Denmark.
(författare)
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Jones, Nykola C.Aarhus Univ, Dept Phys & Astron, ISA, Ny Munkegade 120, DK-8000 Aarhus C, Denmark.
(författare)
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Coreno, MarcelloCNR ISM, Trieste Unit LD2, I-34149 Trieste, Italy.
(författare)
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de Simone, MonicaCNR IOM Lab TASC, I-34149 Trieste, Italy.
(författare)
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Grazioli, CesareCNR ISM, Trieste Unit LD2, I-34149 Trieste, Italy.
(författare)
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Peterson, Kirk A.Washington State Univ, Dept Chem, Pullman, WA 99164 USA.
(författare)
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Baiardi, AlbertoScuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy.
(författare)
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Zhang, TengUppsala universitet,Molekyl- och kondenserade materiens fysik(Swepub:uu)tenzh645
(författare)
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Biczysko, MalgorzataShanghai Univ, Coll Sci, Int Ctr Quantum & Mol Struct, 99 Shangda Rd, Shanghai 200444, Peoples R China.
(författare)
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Univ Edinburgh, Sch Chem, Joseph Black Bldg,David Brewster Rd, Edinburgh EH9 3FJ, Midlothian, Scotland.Aarhus Univ, Dept Phys & Astron, ISA, Ny Munkegade 120, DK-8000 Aarhus C, Denmark.
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Journal of Chemical Physics: AMER INST PHYSICS146:170021-96061089-7690
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Palmer, Michael ...
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Hoffmann, Soren ...
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Jones, Nykola C.
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Coreno, Marcello
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de Simone, Monic ...
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Grazioli, Cesare
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Peterson, Kirk A ...
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Baiardi, Alberto
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Zhang, Teng
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