Near-infrared photoabsorption by C-60 dianions in a storage ring

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Near-infrared photoabsorption by C-60 dianions in a storage ring. / Kadhane, U.; Andersen, J. U.; Bonderup, E.; Concina, B.; Hvelplund, P.; Kirketerp, M. -B. Suhr; Liu, B.; Nielsen, S. Brondsted; Panja, S.; Rangama, J.; Stochkel, K.; Tomita, S.; Zettergren, H.; Hansen, K.; Sunden, A. E. K.; Canton, Sophie; Echt, O.; Forster, J. S.

I: Journal of Chemical Physics, Vol. 131, Nr. 1, 2009.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Harvard

Kadhane, U, Andersen, JU, Bonderup, E, Concina, B, Hvelplund, P, Kirketerp, M-BS, Liu, B, Nielsen, SB, Panja, S, Rangama, J, Stochkel, K, Tomita, S, Zettergren, H, Hansen, K, Sunden, AEK, Canton, S, Echt, O & Forster, JS 2009, 'Near-infrared photoabsorption by C-60 dianions in a storage ring', Journal of Chemical Physics, vol. 131, nr. 1. https://doi.org/10.1063/1.3149775

APA

Kadhane, U., Andersen, J. U., Bonderup, E., Concina, B., Hvelplund, P., Kirketerp, M. -B. S., ... Forster, J. S. (2009). Near-infrared photoabsorption by C-60 dianions in a storage ring. Journal of Chemical Physics, 131(1). https://doi.org/10.1063/1.3149775

CBE

Kadhane U, Andersen JU, Bonderup E, Concina B, Hvelplund P, Kirketerp M-BS, Liu B, Nielsen SB, Panja S, Rangama J, Stochkel K, Tomita S, Zettergren H, Hansen K, Sunden AEK, Canton S, Echt O, Forster JS. 2009. Near-infrared photoabsorption by C-60 dianions in a storage ring. Journal of Chemical Physics. 131(1). https://doi.org/10.1063/1.3149775

MLA

Vancouver

Kadhane U, Andersen JU, Bonderup E, Concina B, Hvelplund P, Kirketerp M-BS et al. Near-infrared photoabsorption by C-60 dianions in a storage ring. Journal of Chemical Physics. 2009;131(1). https://doi.org/10.1063/1.3149775

Author

Kadhane, U. ; Andersen, J. U. ; Bonderup, E. ; Concina, B. ; Hvelplund, P. ; Kirketerp, M. -B. Suhr ; Liu, B. ; Nielsen, S. Brondsted ; Panja, S. ; Rangama, J. ; Stochkel, K. ; Tomita, S. ; Zettergren, H. ; Hansen, K. ; Sunden, A. E. K. ; Canton, Sophie ; Echt, O. ; Forster, J. S. / Near-infrared photoabsorption by C-60 dianions in a storage ring. I: Journal of Chemical Physics. 2009 ; Vol. 131, Nr. 1.

RIS

TY - JOUR

T1 - Near-infrared photoabsorption by C-60 dianions in a storage ring

AU - Kadhane, U.

AU - Andersen, J. U.

AU - Bonderup, E.

AU - Concina, B.

AU - Hvelplund, P.

AU - Kirketerp, M. -B. Suhr

AU - Liu, B.

AU - Nielsen, S. Brondsted

AU - Panja, S.

AU - Rangama, J.

AU - Stochkel, K.

AU - Tomita, S.

AU - Zettergren, H.

AU - Hansen, K.

AU - Sunden, A. E. K.

AU - Canton, Sophie

AU - Echt, O.

AU - Forster, J. S.

N1 - The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)

PY - 2009

Y1 - 2009

N2 - We present a detailed study of the electronic structure and the stability of C-60 dianions in the gas phase. Monoanions were extracted from a plasma source and converted to dianions by electron transfer in a Na vapor cell. The dianions were then stored in an electrostatic ring, and their near-infrared absorption spectrum was measured by observation of laser induced electron detachment. From the time dependence of the detachment after photon absorption, we conclude that the reaction has contributions from both direct electron tunneling to the continuum and vibrationally assisted tunneling after internal conversion. This implies that the height of the Coulomb barrier confining the attached electrons is at least similar to 1.5 eV. For C-60(2-) ions in solution electron spin resonance measurements have indicated a singlet ground state, and from the similarity of the absorption spectra we conclude that also the ground state of isolated C-60(2-) ions is singlet. The observed spectrum corresponds to an electronic transition from a t(1u) lowest unoccupied molecular orbital (LUMO) of C-60 to the t(1g) LUMO+1 level. The electronic levels of the dianion are split due to Jahn-Teller coupling to quadrupole deformations of the molecule, and a main absorption band at 10723 cm(-1) corresponds to a transition between the Jahn-Teller ground states. Also transitions from pseudorotational states with 200 cm(-1) and (probably) 420 cm(-1) excitation are observed. We argue that a very broad absorption band from about 11 500 cm(-1) to 13 500 cm(-1) consists of transitions to so-called cone states, which are Jahn-Teller states on a higher potential-energy surface, stabilized by a pseudorotational angular momentum barrier. A previously observed, high-lying absorption band for C-60(-) may also be a transition to a cone state.

AB - We present a detailed study of the electronic structure and the stability of C-60 dianions in the gas phase. Monoanions were extracted from a plasma source and converted to dianions by electron transfer in a Na vapor cell. The dianions were then stored in an electrostatic ring, and their near-infrared absorption spectrum was measured by observation of laser induced electron detachment. From the time dependence of the detachment after photon absorption, we conclude that the reaction has contributions from both direct electron tunneling to the continuum and vibrationally assisted tunneling after internal conversion. This implies that the height of the Coulomb barrier confining the attached electrons is at least similar to 1.5 eV. For C-60(2-) ions in solution electron spin resonance measurements have indicated a singlet ground state, and from the similarity of the absorption spectra we conclude that also the ground state of isolated C-60(2-) ions is singlet. The observed spectrum corresponds to an electronic transition from a t(1u) lowest unoccupied molecular orbital (LUMO) of C-60 to the t(1g) LUMO+1 level. The electronic levels of the dianion are split due to Jahn-Teller coupling to quadrupole deformations of the molecule, and a main absorption band at 10723 cm(-1) corresponds to a transition between the Jahn-Teller ground states. Also transitions from pseudorotational states with 200 cm(-1) and (probably) 420 cm(-1) excitation are observed. We argue that a very broad absorption band from about 11 500 cm(-1) to 13 500 cm(-1) consists of transitions to so-called cone states, which are Jahn-Teller states on a higher potential-energy surface, stabilized by a pseudorotational angular momentum barrier. A previously observed, high-lying absorption band for C-60(-) may also be a transition to a cone state.

KW - potential energy surfaces

KW - paramagnetic resonance

KW - nonradiative transitions

KW - Jahn-Teller effect

KW - infrared spectra

KW - ground states

KW - fullerenes

KW - charge exchange

KW - electron detachment

KW - rotational states

KW - tunnelling

KW - vibrational states

U2 - 10.1063/1.3149775

DO - 10.1063/1.3149775

M3 - Article

VL - 131

JO - Journal of Chemical Physics

T2 - Journal of Chemical Physics

JF - Journal of Chemical Physics

SN - 0021-9606

IS - 1

ER -