Publication
Reference
Zheng Weijun, Kaiser Ralf I. (2007). An infrared spectroscopy study of the phase transition in solid ammonia. Chem. Phys. Lett., 440, 229 - 234.
Names
  • Weijun Zheng
  • Ralf I. Kaiser
Article and keywords
Title
An infrared spectroscopy study of the phase transition in solid ammonia
Abstract
The infrared spectra of solid ammonia at different phases and the existence of a metastable phase have been in controversy for the last fifty years. In order to address this problem, we studied the infrared spectra of solid ammonia in an ultrahigh vacuum chamber at distinct temperatures. Having prepared amorphous ammonia at 10 K, we observed a transition from the amorphous phase to the cubic crystalline phase at 57 K; successive re- cooling from 85 K back to 10 K confirms the presence of crystalline ammonia. No metastable phase has been detected.
Keywords
spectroscopy, transmission, absorbance spectra, band position, band vibration mode, mid-IR, near-IR, low temperature, amorphous, crystalline, phase change, molecular solid, ice, NH3
Content
spectral data, band list data, sample
Year
2007
Journal
Chemical Physics Letters
Volume
440
Number
4
Pages
229 - 234
Pages number
6
Document type
article
Publication state
published
Doi
10.1016/j.cplett.2007.04.070
Identifiers