title: A method to obtain the absorption coefficient spectrum of single grain coal in the aliphatic C-H stretching region using infrared transflection microspectroscopy.
abstract: A method was developed to obtain the absorption coefficient spectrum of a grain of coal (as small as 10(-7)) in the region of aliphatic and aromatic C-H stretching bands (2700-3200 cm(-1)) using infrared transflection microspectroscopy. In this method, the complex refractive index n - ik was determined using an optimization algorithm with the Kramers-Kronig transform so that the calculated transflection spectrum from the Fresnel equation corresponded to the measured one. The obtained absorption coefficients were compared with the bulk values determined from the potassium bromide (KBr) pellet measurement method.
authors.affiliation: Osaka University, Department of Earth and Space Science, Graduate School of Science, Machikaneyama-cho 1-1, Toyonaka, Osaka 560-0043, Japan.
authors.forename: Ryota
authors.initials: R
authors.lastname: Tonoue
authors.affiliation: Osaka University, Department of Earth and Space Science, Graduate School of Science, Machikaneyama-cho 1-1, Toyonaka, Osaka 560-0043, Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Katsura
authors.affiliation: Osaka University, Department of Earth and Space Science, Graduate School of Science, Machikaneyama-cho 1-1, Toyonaka, Osaka 560-0043, Japan.
authors.forename: Mai
authors.initials: M
authors.lastname: Hamamoto
authors.affiliation: Osaka University, Department of Earth and Space Science, Graduate School of Science, Machikaneyama-cho 1-1, Toyonaka, Osaka 560-0043, Japan.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Bessho
authors.affiliation: Osaka University, Department of Earth and Space Science, Graduate School of Science, Machikaneyama-cho 1-1, Toyonaka, Osaka 560-0043, Japan.
authors.forename: Satoru
authors.initials: S
authors.lastname: Nakashima