EXPERIMENTAL MEASUREMENT OF THE INDUCED DIPOLE MOMENT OF AN ISOLATED MOLECULE IN ITS GROUND AND ELECTRONICALLY EXCITED STATES. INDOLE AND INDOLE- H$_2$O
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Date
2005
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Publisher
Ohio State University
Abstract
Reported here are measurements of the magnitude and orientation of the induced dipole moment that is produced when an indole molecule in its ground S${_0}$ and electronically excited S${_1}$ states is polarized by the attachment of a hydrogen bonded water molecule in the gas phase complex indole-H$_2$O. We find the permanent dipole moment values $\mu_{IW} (S{_0}) = 4.4$ and $\mu_{IW} (S{_1}) = 4.0 D$, values that are substantially different from calculated values based on vector sums of the dipole moments of the component parts. From this result, we derive the induced dipole moment values $\mu_{IW}^{*}(S{_0}) = 0.7$ and $\mu_{IW}^{*} (S{_1}) = 0.5 D$. The orientation of the induced moment also is significantly different in the two electronic states. These results are quantitatively reproduced by a purely electrostatic calculation based on {\em ab initio} values of multipole moments.
Description
{Work supported by NSF
Author Institution: Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260; Department of Chemistry, Syracuse University Syracuse, NY 13244
Author Institution: Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260; Department of Chemistry, Syracuse University Syracuse, NY 13244