title: [Anomalous absorption and a qualified far infrared spectrum].
abstract: The ideal 100% line could not be obtained when the content of water vapor in the spectrometer is constant but high during the whole procedure of a far-infrared spectrum collection. This result indicates that anomalous absorption phenomenon takes place in high relative humidity atmosphere. In the present paper, the influences of the relative humidity of ambient air and spectral resolution on anomalous absorption were studied. It was found that both decreasing the water vapor content in the spectrometer and adopting low spectral resolution are effective methods to avoid anomalous absorption. Furthermore, the water vapor bands can be eliminated by "dry air and wet air titration" in the fluctuant humidity. This provides us a quick and economic method to obtain a qualified far infrared spectrum conveniently. It should be noticed that the working condition for "dry air and wet air titration" is low relative humidity to prevent water vapor abnormal absorption.
authors.affiliation: School of Chemistry & Chemical Engineering, South China University of Technology, Guangzhou 510640, China. huyanqin87@163.com
authors.forename: Yan-qin
authors.initials: YQ
authors.lastname: Hu
authors.forename: Yu-jing
authors.initials: YJ
authors.lastname: Chen
authors.forename: Hui-hua
authors.initials: HH
authors.lastname: Li
authors.forename: Hai-shui
authors.initials: HS
authors.lastname: Wang