Two-dimensional circularly polarized IR photon echo spectroscopy of polypeptides: Four-wave-mixing optical activity measurement

Jun Ho Choi, Minhaeng Cho

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

A coherent two-dimensional (2D) optical spectroscopy utilizing circularly polarized (CP) beams, which was shown to be useful in studying molecular chirality in condensed phases, was theoretically proposed recently [Cho et al. J. Chem. Phys. 2003, 119, 7003]. A photon echo (PE) version of 2D optical activity spectroscopy is discussed in this paper. Considering various dipeptide and polypeptide systems, where the amide I local modes constitute the set of basis modes used to describe exciton and biexciton states as linear combinations of those basis modes, we present numerically simulated 2D circularly polarized IR PE spectra. It is shown that this novel spectroscopic method can provide additional information on the angles between the transition magnetic dipóle and the transition electric dipole of two different vibrationally excited states, which are highly sensitive to the 3D structure and chirality of a given polypeptide. Also, a hierarchical relation of IR absorption, vibrational circular dichroism, 2D IR PE, and 2D CP-IR PE is discussed to show advantages of 2D optical activity spectroscopy in general.

Original languageEnglish
Pages (from-to)5176-5184
Number of pages9
JournalJournal of Physical Chemistry A
Volume111
Issue number24
DOIs
Publication statusPublished - 2007 Jun 21

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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