TY - JOUR
T1 - Electronic excitations of magnesium tetraphenylporphyrin in supersonic expansions
AU - Even, Uzi
AU - Magen, Yaacov
AU - Jortner, Joshua
AU - Levanon, Haim
PY - 1981
Y1 - 1981
N2 - In this paper we report the results of our experimental study of the fluorescence excitation spectrum of Mg tetraphenylporphyrin (MgTPP) seeded in supersonic expansions of He. The spectra of the "isolated," internally cold, bare MgTPP molecule reveal a well-resolved vibrational structure for the S0→S1 transition (the Q band), as well as for the S0→S2 transition (the Soret, B band). The vibrational structure in the S1 state reveals low-frequency, large amplitude motion, giving rise to two distinct even-parity vibrational progressions, with frequencies ω1=14.5 cm-1 and ω2=24. 5 cm-1. Higher vibrational excitations in the S1 manifold of MgTPP are in good agreement with the fundamental frequencies of chlorophyll a. The spectroscopy of the Soret band of MgTPP provided information regarding the dynamics of interstate radiationless relaxation of low-lying vibrational excitations of the S2 state, which decay on the ps time scale.
AB - In this paper we report the results of our experimental study of the fluorescence excitation spectrum of Mg tetraphenylporphyrin (MgTPP) seeded in supersonic expansions of He. The spectra of the "isolated," internally cold, bare MgTPP molecule reveal a well-resolved vibrational structure for the S0→S1 transition (the Q band), as well as for the S0→S2 transition (the Soret, B band). The vibrational structure in the S1 state reveals low-frequency, large amplitude motion, giving rise to two distinct even-parity vibrational progressions, with frequencies ω1=14.5 cm-1 and ω2=24. 5 cm-1. Higher vibrational excitations in the S1 manifold of MgTPP are in good agreement with the fundamental frequencies of chlorophyll a. The spectroscopy of the Soret band of MgTPP provided information regarding the dynamics of interstate radiationless relaxation of low-lying vibrational excitations of the S2 state, which decay on the ps time scale.
UR - http://www.scopus.com/inward/record.url?scp=36749106745&partnerID=8YFLogxK
U2 - 10.1063/1.443012
DO - 10.1063/1.443012
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AN - SCOPUS:36749106745
SN - 0021-9606
VL - 76
SP - 5684
EP - 5692
JO - The Journal of Chemical Physics
JF - The Journal of Chemical Physics
IS - 12
ER -