CH₄ Ice at 20 K
| Sample Type | Ice |
|---|---|
| Components | CH₄ |
| Ratio | 1 |
| Substrate | Si |
| Phase / State | Crystalline |
| Reference Temperature | 20 K |
| Wavenumber (cm⁻¹) | 5000 - 25000 |
| Wavelength (µm) | 0.4 - 2 |
Crystalline methane (CH₄) ice deposited at 10 K onto a silicon (Si) substrate, then annealed at 20 K, and held at 20 K during spectroscopic measurements.
The real part (n) of the complex index of refraction was calculated from 0.4 to 2.0 μm from the refractive indices of liquid CH₄ at 110 K and the densities of liquid and solid CH₄.
More information can be found in the publication and on the OCdb contributor's page.
Any use of this data should recognize the parent publication(s):
Khare, B. N., Thompson, W. R., Sagan, C., Arakawa, E. T., Bruel, C., Judish, J. P., Khanna, R. K. and Pollack, J. B. (1990) 'Optical Constants of Solid Methane', pp. 327-339 in NASA Conference Publication 3077, First International Conference on Laboratory Research for Planetary Atmospheres, Proceedings of a conference held at Bowie State University, Bowie, Maryland, October 25-27, 1989.
n Values
Compatible Datasets (i.e., same molecule, phase, and temperature) are marked with *
| Select | Chemical | Ratio | Phase / State | T (K) | Wavelength Min (µm) |
Wavelength Max (µm) |
Compatible | n | k | Reference |
|---|---|---|---|---|---|---|---|---|---|---|
|
|
CH₄ | 1 | 10 | 2.703 | 3248.8 | ✓ | ✓ | Hudgins et al. (1993) | ||
|
|
CH₄ | 1 | 20 | 2.703 | 3248.8 | ✓ | ✓ | Hudgins et al. (1993) | ||
|
|
CH₄ | 1 | 30 | 2.703 | 9.998 | ✓ | ✓ | Hudgins et al. (1993) | ||
|
|
CH₄ | 1 | Crystalline | 31 | 2 | 20 | ✓ | ✓ | Gerakines and Hudson (2020) | |
|
|
CH₄ | 1 | Crystalline | 33 | 1.133 | 2.608 | - | ✓ | Khare et al. (1990) |