Measuring accurate optical constants of uranium minerals for use in optical modeling of infrared spectra

2021 ◽  
Author(s):  
Tanya L. Myers ◽  
Brent M. DeVetter ◽  
Danielle L. Saunders ◽  
Charmayne E. Lonergan ◽  
Michael O. Yokosuk ◽  
...  
Keyword(s):  
Infrared Spectra ◽  
Optical Constants ◽  
Optical Modeling ◽  
Uranium Minerals

INFRARED SPECTRA AND OPTICAL CONSTANTS OF ELUSIVE AMORPHOUS METHANE

2015 ◽  
Vol 805 (2) ◽  
pp. L20 ◽  
Author(s):  
Perry A. Gerakines ◽  
Reggie L. Hudson
Keyword(s):  
Infrared Spectra ◽  
Optical Constants

EXPRESS: Accurate Measurement of the Optical Constants n and k for a Series of 57 Inorganic and Organic Liquids for Optical Modeling and Detection

2017 ◽  
pp. 000370281773581
Author(s):  
Tanya L. Myers ◽  
Russell G. Tonkyn ◽  
Tyler O. Danby ◽  
Matthew S. Taubman ◽  
Bruce E. Bernacki ◽  
...  
Keyword(s):  
Optical Constants ◽  
Organic Liquids ◽  
Optical Modeling ◽  
Inorganic And Organic

scholarly journals Infrared spectra and optical constants of astronomical ices: II. Ethane and ethylene

Icarus ◽  
2014 ◽  
Vol 243 ◽  
pp. 148-157 ◽  
Author(s):  
R.L. Hudson ◽  
P.A. Gerakines ◽  
M.H. Moore
Keyword(s):  
Infrared Spectra ◽  
Optical Constants

Infrared-Optical Characterization of Metallic Island Films

1997 ◽  
Vol 51 (6) ◽  
pp. 902-904 ◽  
Author(s):  
Arnulf Röseler ◽  
Ernst-Heiner Korte
Keyword(s):  
Infrared Spectra ◽  
Infrared Absorption ◽  
Optical Constants ◽  
Optical Characterization ◽  
Effective Medium ◽  
Island Film ◽  
Surface Enhanced ◽  
Effective Medium Approach ◽  
Island Films

The ellipsometric infrared spectra of a metallic island film indicate its potential for surface-enhanced infrared absorption (SEIRA). Such a film is characterized by unique optical constants, and these can be simulated by using an effective-medium approach.

scholarly journals INFRARED SPECTRA AND OPTICAL CONSTANTS OF NITRILE ICES RELEVANT TO TITAN's ATMOSPHERE

2010 ◽  
Vol 191 (1) ◽  
pp. 96-112 ◽  
Author(s):  
Marla H. Moore ◽  
Robert F. Ferrante ◽  
W. James Moore ◽  
Reggie Hudson
Keyword(s):  
Infrared Spectra ◽  
Optical Constants

scholarly journals Densities, infrared band strengths, and optical constants of solid methanol

2018 ◽  
Vol 617 ◽  
pp. A116 ◽  
Author(s):  
Ramón Luna ◽  
Germán Molpeceres ◽  
Juan Ortigoso ◽  
Miguel Angel Satorre ◽  
Manuel Domingo ◽  
...  
Keyword(s):  
Infrared Spectra ◽  
Optical Constants ◽  
High Vacuum ◽  
Laboratory Data ◽  
Laser Interferometry ◽  
Infrared Band ◽  
Vacuum Chambers ◽  
Iterative Minimization ◽  
Minimization Procedure ◽  
Different Thickness

Contact. The increasing capabilities of space missions like the James Webb Space Telescope or ground-based observatories like the European Extremely Large Telescope demand high quality laboratory data of species in astrophysical conditions for the interpretation of their findings. Aims. We provide new physical and spectroscopic data of solid methanol that will help to identify this species in astronomical environments. Methods. Ices were grown by vapour deposition in high vacuum chambers. Densities were measured via a cryogenic quartz crystal microbalance and laser interferometry. Absorbance infrared spectra of methanol ices of different thickness were recorded to obtain optical constants using an iterative minimization procedure. Infrared band strengths were determined from infrared spectra and ice densities. Results. Solid methanol densities measured at eight temperatures vary between 0.64 g cm−3 at 20 K and 0.84 g cm−3 at 130 K. The visible refractive index at 633 nm grows from 1.26 to 1.35 in that temperature range. New infrared optical constants and band strengths are given from 650 to 5000 cm−1 (15.4–2.0 μm) at the same eight temperatures. The study was made on ices directly grown at the indicated temperatures, and amorphous and crystalline phases have been recognized. Our optical constants differ from those previously reported in the literature for an ice grown at 10 K and subsequently warmed. The disagreement is due to different ice morphologies. The new infrared band strengths agree with previous literature data when the correct densities are considered.

Investigation of infrared spectra and determination of the main optical constants, of CaB6

1997 ◽  
Vol 36 (7-8) ◽  
pp. 413-415 ◽  
Author(s):  
G. G. Tsebulya ◽  
G. K. Kozina ◽  
A. P. Zakharchuk ◽  
A. V. Kovalev ◽  
E. M. Dudnik
Keyword(s):  
Infrared Spectra ◽  
Optical Constants

Accurate Measurement of the Optical Constants n and k for a Series of 57 Inorganic and Organic Liquids for Optical Modeling and Detection

2017 ◽  
Vol 72 (4) ◽  
pp. 535-550 ◽  
Author(s):  
Tanya L. Myers ◽  
Russell G. Tonkyn ◽  
Tyler O. Danby ◽  
Matthew S. Taubman ◽  
Bruce E. Bernacki ◽  
...  
Keyword(s):  
Optical Constants ◽  
Organophosphorus Compounds ◽  
Soda Lime ◽  
Organic Liquids ◽  
Soda Lime Glass ◽  
Dimethyl Methylphosphonate ◽  
Glass Substrates ◽  
Optical Modeling ◽  
Metal Aluminum ◽  
Path Lengths

For optical modeling and other purposes, we have created a library of 57 liquids for which we have measured the complex optical constants n and k. These liquids vary in their nature, ranging in properties that include chemical structure, optical band strength, volatility, and viscosity. By obtaining the optical constants, one can model most optical phenomena in media and at interfaces including reflection, refraction, and dispersion. Based on the works of others, we have developed improved protocols using multiple path lengths to determine the optical constants n/k for dozens of liquids, including inorganic, organic, and organophosphorus compounds. Detailed descriptions of the measurement and data reduction protocols are discussed; agreement of the derived optical constant n and k values with literature values are presented. We also present results using the n/k values as applied to an optical modeling scenario whereby the derived data are presented and tested for models of 1 µm and 100 µm layers for dimethyl methylphosphonate (DMMP) on both metal (aluminum) and dielectric (soda lime glass) substrates to show substantial differences between the reflected signal from highly reflective substrates and less-reflective substrates.

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