Absolute intensities and optical constants of crystalline C2N2 in the infrared region

Ospina, M.J.; Zhao, Guizhi; Khanna, R. K.

doi:10.1016/0584-8539(88)80255-1

Cited by 7 publications

(14 citation statements)

References 21 publications

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“…We used a standard method for the propagation of errors to estimate the uncertainties (Garland et al 2002, p. 53). For comparison, we show previously measured values for these nitriles and values assumed by Dello Russo & Khanna (1996) or Ospina et al (1988).…”

Section: Laboratory Proceduresmentioning

confidence: 98%

“…During deposition, the number of laser interference fringe maxima (m) recorded was used to calculate Notes. a Weast 1986, b Calculated by Masterson & Khanna 1990, c Assumed by Ospina et al 1988, d Iloukhani & Almasi 2009Riddick et al 1986, e Assumed by Dello Russo 1994, f Moureu & Bongrad 1920, g Calculated by Khanna 2005b the ice's thickness using the equation…”

Section: Laboratory Proceduresmentioning

confidence: 99%

“…Previous laboratory studies of several crystalline nitrile ices relevant to the atmosphere of Titan, including the extraction of optical constants from measured spectra, were published in a series of papers from the University of Maryland between 1988 and 1996. Ospina et al (1988) showed plots of calculated n and k values for crystalline phase C 2 N 2 from 4000 to 200 cm −1 , where n and k are the real and imaginary parts of the complex index of refraction. Following this, 4000-450 cm −1 spectra and optical constants of HCN and HC 3 N were tabulated and published by Masterson & Khanna (1990).…”

Section: Introductionmentioning

confidence: 99%

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

Moore

Ferrante

Moore

et al. 2010

ApJS

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Spectra and optical constants of nitrile ices known or suspected to be in Titan's atmosphere are presented from 2.0 to 333.3 μm (∼5000-30 cm −1 ). These results are relevant to the ongoing modeling of Cassini CIRS observations of Titan's winter pole. Ices studied are: HCN, hydrogen cyanide; C 2 N 2 , cyanogen; CH 3 CN, acetonitrile; C 2 H 5 CN, propionitrile; and HC 3 N, cyanoacetylene. For each of these molecules, we also report new cryogenic measurements of the real refractive index, n, determined in both the amorphous and crystalline phases at 670 nm. These new values have been incorporated into our optical constant calculations. Spectra were measured and optical constants were calculated for each nitrile at a variety of temperatures, including, but not limited to, 20, 35, 50, 75, 95, and 110 K, in both the amorphous phase and the crystalline phase. This laboratory effort used a dedicated FTIR spectrometer to record transmission spectra of thin-film ice samples. Laser interference was used to measure film thickness during condensation onto a transparent cold window attached to the tail section of a closed-cycle helium cryostat. Optical constants, real (n) and imaginary (k) refractive indices, were determined using Kramers-Kronig analysis. Our calculation reproduces the complete spectrum, including all interference effects.

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Section: Laboratory Proceduresmentioning

confidence: 98%

Section: Laboratory Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Moore

Ferrante

Moore

et al. 2010

ApJS

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“…Therefore, thicknesses for crystalline cyanogen were found from the smooth, regular pattern of channel fringes in the iceʼs IR spectrum. For N fr channel fringes observed over a wavenumber interval  n D , the sampleʼs thickness was just N fr /(2 n 670  n D ); see, as examples, either Harrick (1971), Griffiths & de Haseth (1986), or Ospina et al (1988). In all cases, a refractive index (n 670 ) was needed to determine an ice thickness and an ice density was required to calculate a band strength with Equation (1).…”

Section: Laboratory Proceduresmentioning

confidence: 99%

“…Note that a resolution of 1 cm −1 was used to record the IR spectra of Figures 1 and 2, and for the data leading to Tables 1 and 3, higher resolutions (e.g., 0.5 cm −1 ) giving essentially the same results. Our resolutions bracketed the 0.6 cm −1 used by Ospina et al (1988).…”

Section: Infrared Spectra Of Icesmentioning

confidence: 99%

Infrared Spectra and Vapor Pressures of Crystalline C₂N₂, with Comparisons to Crystalline HCN

Hudson,

Gerakines

2023

Planet. Sci. J.

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In a continuation of our work on nitriles, we have examined cyanogen (C2N2) as a crystalline solid, comparing the results to our recent work on crystalline hydrogen cyanide (HCN). A density and refractive index for C2N2 ice were measured and used to prepare solid samples from which infrared (IR) spectra, band strengths, and optical constants were measured. The vapor pressures (sublimation pressures) of both C2N2 and HCN ices were determined with a quartz-crystal microbalance at temperatures relevant to Titan's atmosphere and much lower than those in the literature. Comparisons of the newly measured low-temperature vapor pressures to values extrapolated from higher temperatures revealed differences on the order of 45 and 130%. The enthalpies of sublimation of C2N2 and HCN in the 120 K region were measured and found to be similar to those at higher temperatures. Comparisons were made to previous spectroscopic work, but hindered in the case of IR intensities by the lack of published details.

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Optical Properties of Ices From UV to Infrared

Schmitt

Quirico

Trotta

et al. 1998

Astrophysics and Space Science Library

117

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Absolute intensities and optical constants of crystalline C2N2 in the infrared region

Cited by 7 publications

References 21 publications

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

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

Infrared Spectra and Vapor Pressures of Crystalline C₂N₂, with Comparisons to Crystalline HCN

Optical Properties of Ices From UV to Infrared

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Absolute intensities and optical constants of crystalline C2N2 in the infrared region

Cited by 7 publications

References 21 publications

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

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

Infrared Spectra and Vapor Pressures of Crystalline C2N2, with Comparisons to Crystalline HCN

Optical Properties of Ices From UV to Infrared

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Product

Resources

About

Infrared Spectra and Vapor Pressures of Crystalline C₂N₂, with Comparisons to Crystalline HCN