Nafie L A, Yu G S, Qu X, Freedman T B
Department of Chemistry, Syracuse University, New York 13244-4100, USA.
Faraday Discuss. 1994(99):13-34; discussion 87-101. doi: 10.1039/fd9949900013.
Natural vibrational optical activity consists of two principal forms. The IR form is known as vibrational circular dichroism (VCD) and is simply the extension of electronic circular dichroism into the IR vibrational region of the spectrum. The Raman form, known as Raman optical activity (ROA), is a new form of optical activity that has no counterpart in the classical forms of optical activity. In this paper, the similarities and differences of the IR and Raman forms of vibrational optical activity will be examined. Although both VCD and ROA were discovered and confirmed in the period from 1973 to 1975, each field has evolved independently with key advances in theoretical description, instrumentation and application coming at different times over the past 20 years. The current relative strengths and weaknesses of VCD and ROA will be discussed, and specific examples of VOA spectra of (-)-alpha-pinene and the amino acid L-alanine, for which overlapping VCD and ROA data are available, will be presented.
自然振动光学活性主要由两种形式组成。红外形式被称为振动圆二色性（VCD），它简单地是将电子圆二色性扩展到光谱的红外振动区域。拉曼形式，即拉曼光学活性（ROA），是一种新型的光学活性，在经典光学活性形式中没有对应物。在本文中，将研究红外和拉曼形式的振动光学活性的异同。尽管VCD和ROA都是在1973年至1975年期间被发现和证实的，但在过去20年里，每个领域都是独立发展的，理论描述、仪器设备和应用方面的关键进展出现在不同时期。将讨论VCD和ROA当前相对的优缺点，并给出（-）-α-蒎烯和氨基酸L-丙氨酸的VOA光谱的具体例子，对于这两种物质，有重叠的VCD和ROA数据。
