- Modality
- NIR
- Category
- liquid
- Material Type
- Alkane
- Sample ID
- Methane XCEL
- Collection Locality
- condensed from natural gas
- Spectral Purity
- 1a2a3a4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns
- Composition / XRD
- COMPOSITION_TRACE: None
- Sample Description
- Sample is a gas at room temperature Other Names: methane; Marsh gas; Methyl hydride; Biogas; Fire Damp; R 50 (refrigerant) CAS #:74-82-8 Methane Gas was purchased from Excel Energy. The original purity was 90%, spectra were collected of the material at approximately 77K in which allowed impurities to separate. No signs of ethane or propane were seen in the spectrum. Spectrum and sample description was published in: Clark, R.N., Curchin, J.M., Hoefen, T.M., and Swayze, G.A., 2009, Reflectance spectroscopy of organic compounds I: Alkanes: Journal of Geophysical Research, 114, p. E03001, doi:10.1029/2008JE003150. http://www.agu.org/pubs/crossref/2009/2008JE003150.shtml "The methane contained a few percent ethane, propane and higher molecular weight organics. However, in condensing the meth- ane into a liquid, the higher molecular weight organics froze first and were gravitationally isolated and did not contribute to the measured spectra. We detect no ethane, propane or other organics in the methane spectra, thus the methane purity was greater than 99% except for dissolved nitrogen which is spectrally inert." Note, at 77 K, methane would normally freeze. But in a 1-bar nitrogen atmosphere, the dissolved nitrogen suppresses the freezing point to below 77 Kelvins. IMAGE_OF_SAMPLE: Not Available
- X Units
- cm⁻¹
- Y Units
- Absorbance
- Data Points
- 2,126