Infrared and Visible Photodissociation Spectra of Rhodamine Ions at 3 K in the Gas Phase

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• 作者：Juraj Ja?ík ; Rafael Navrátil ; Ivan Němec ; Jana Roithová
• 刊名：Journal of Physical Chemistry A
• 出版年：2015
• 出版时间：December 24, 2015
• 年：2015
• 卷：119
• 期：51
• 页码：12648-12655
• 全文大小：648K
• ISSN：1520-5215

文摘

Helium-tagging predissociation spectroscopy in the visible spectral range (He@VisPD) is shown for Rhodamine 123, Rhodamine 110, and Rhodamine 110’s silver salt (silver carboxylate). It is shown that the spectra reflect single-photon absorption. The helium-tagged ions are in the ground vibrational state, and the He@VisPD spectra feature the Franck–Condon envelopes for the excitation to the first excited singlet state that agree very well with theoretical simulations. The S₀ → S₁ excitation energies are 2.712 ± 0.006 eV for Rhodamine 123, 2.700 ± 0.006 eV for Rhodamine 110, and 2.751 ± 0.006 eV for the silver salt of Rhodamine 110. The determined energies can be slightly blue-shifted due to the binding energy of helium. The Rhodamine ions were also characterized by helium-tagging infrared photodissociation spectroscopy. The distinctive spectral features of the individual derivatives are described and the spectra are compared to the classical solid-state IR spectra.