Development of an Apparatus for Terahertz Spectroscopy in an Ultrahigh Vacuum - Temperature Dependence of the Spectrum of Vapor-Deposited D<sub>2</sub>O Ice
At a Glance
Section titled “At a Glance”| Metadata | Details |
|---|---|
| Publication Date | 2018-01-01 |
| Journal | Vacuum and Surface Science |
| Authors | Genki Shimizu, Natsumi Suzuki, Hirokazu Nasu, Rei Tsuboi, Hiroyuki Kurahashi |
| Institutions | Gakushuin University |
| Citations | 1 |
Abstract
Section titled “Abstract”An apparatus for terahertz spectroscopy in an ultrahigh vacuum has been developed. We used broadband Mylar for the beam splitter in a Fourier transform spectrometer, diamond for optical windows, and a liquid-helium-cooled Si bolometer for the terahertz detector to achieve the spectral range of 50-650 cm−1. For the purpose of keeping the ultrahigh vacuum in a sample chamber, we evacuated the whole optical path by turbo molecular pumps and made its pressure down to 10−4 Pa. Using this apparatus, we measured temperature dependence of the terahertz spectrum of D2O ice vapor-deposited at 10 K. The spectral changes due to the structural transformation from amorphous ice to cubic crystalline ice Ic were successfully observed in the range of 140-160 K. We report the spectral difference between low-density and high-density amorphous ice as well as that between hexagonal crystalline ice Ih and cubic one.