title: Demonstration of partially transparent thick metallic sodium in the vacuum ultraviolet spectral range.
abstract: We describe the direct measurement of actual transmittance of sodium samples with thickness of a 2 mm and 3 mm in a spectral range >115 nm, resulting in >50% transmittance of 3 mm thick solid and liquid sodium samples including transmission of a pair of the windows at the wavelength of 120 nm, giving an extinction coefficient of ~10(-6) to ~10(-7) which represents the sodium with a few cm thickness to be partially transparent for this wavelength. To confirm the measurement, we perform simple imaging experiments by the ultra-violet light passing through a 8 mm-thick sodium sample to illuminate a mesh as an object, resulting in obtaining a clear image.
authors: Hiroyuki
authors: H
authors: Daido
authors: Yoji
authors: Y
authors: Suzuki
authors: Tetsuya
authors: T
authors: Kawachi
authors: Takeshi
authors: T
authors: Fukuda
authors: Toshio
authors: T
authors: Nakagiri
authors: Masanori
authors: M
authors: Kaku
authors: Shoichi
authors: S
authors: Kubodera