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J/A+A/540/A2        Refractive index of hydrocarbon solids    (Jones, 2012)
Variations on a theme - the evolution of hydrocarbon solids.
II. Optical property modelling - the optEC(s) model.
    Jones A.
   <Astron. Astrophys. 540, A2 (2012)>
   =2012A&A...540A...2J
ADC_Keywords: Interstellar medium ; Models

Keywords: dust, extinction - ISM: general


Abstract:
    The properties of hydrogenated amorphous carbon (a-C:H) dust are known
    to evolve in response to the local conditions.

    We present an adaptable model for the determination of the optical
    properties of low-temperature, interstellar a-C:H grains that is based
    on the fundamental physics of their composition.

Description:
    The imaginary part of the complex refractive index m(n,k), k, for
    a-C:H materials, from 50eV to cm wavelengths, is derived and the real
    part, n, of the complex refractive index m(n,k) is then calculated
    using the Kramers-Kronig relations.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
optecsn.dat      159     1000  *Real part of the refractive index data
optecsk.dat      159     1000  *Imaginary part of the refractive index data

Note on *.dat: for a suite of a-C:H materials predicted by the optEC(s) model
  as a function of wavelength [micron], energy E [eV] and band gap Eg [eV].


See also:
     J/A+A/542/A98 : Hydrocarbon solids. optEC(s) model. II. (Jones, 2012)


Byte-by-byte Description of file: optecsn.dat

   Bytes Format Units   Label     Explanations

   1-  9  E9.4  um      lambda    Wavelength
  11- 19  E9.4  eV      E         Energy equivalent to wavelength
  21- 29  E9.4  ---     n0        Real part of m(n,k) Eg = -0.1  eV (Eg-)
  31- 39  E9.4  ---     n1        Real part of m(n,k) Eg =  0.0  eV
  41- 49  E9.4  ---     n2        Real part of m(n,k) Eg =  0.1  eV
  51- 59  E9.4  ---     n3        Real part of m(n,k) Eg =  0.25 eV
  61- 69  E9.4  ---     n4        Real part of m(n,k) Eg =  0.5  eV
  71- 79  E9.4  ---     n5        Real part of m(n,k) Eg =  0.75 eV
  81- 89  E9.4  ---     n6        Real part of m(n,k) Eg =  1.0  eV
  91- 99  E9.4  ---     n7        Real part of m(n,k) Eg =  1.5  eV
 101-109  E9.4  ---     n8        Real part of m(n,k) Eg =  1.15 eV
 111-119  E9.4  ---     n9        Real part of m(n,k) Eg =  1.75 eV
 121-129  E9.4  ---     n10       Real part of m(n,k) Eg =  2.0  eV
 131-139  E9.4  ---     n11       Real part of m(n,k) Eg =  2.25 eV
 141-149  E9.4  ---     n12       Real part of m(n,k) Eg =  2.5  eV
 151-159  E9.4  ---     n13       Real part of m(n,k) Eg =  2.67 eV (Eg+)


Byte-by-byte Description of file: optecsk.dat

   Bytes Format Units   Label     Explanations

   1-  9  E9.4  um      lambda    Wavelength
  11- 19  E9.4  eV      E         Energy equivalent to wavelength
  21- 29  E9.4  ---     k0        Imaginary part of m(n,k) Eg = -0.1  eV (Eg-)
  31- 39  E9.4  ---     k1        Imaginary part of m(n,k) Eg =  0.0  eV
  41- 49  E9.4  ---     k2        Imaginary part of m(n,k) Eg =  0.1  eV
  51- 59  E9.4  ---     k3        Imaginary part of m(n,k) Eg =  0.25 eV
  61- 69  E9.4  ---     k4        Imaginary part of m(n,k) Eg =  0.5  eV
  71- 79  E9.4  ---     k5        Imaginary part of m(n,k) Eg =  0.75 eV
  81- 89  E9.4  ---     k6        Imaginary part of m(n,k) Eg =  1.0  eV
  91- 99  E9.4  ---     k7        Imaginary part of m(n,k) Eg =  1.5  eV
 101-109  E9.4  ---     k8        Imaginary part of m(n,k) Eg =  1.15 eV
 111-119  E9.4  ---     k9        Imaginary part of m(n,k) Eg =  1.75 eV
 121-129  E9.4  ---     k10       Imaginary part of m(n,k) Eg =  2.0  eV
 131-139  E9.4  ---     k11       Imaginary part of m(n,k) Eg =  2.25 eV
 141-149  E9.4  ---     k12       Imaginary part of m(n,k) Eg =  2.5  eV
 151-159  E9.4  ---     k13       Imaginary part of m(n,k) Eg =  2.67 eV (Eg+)


History:
    * 13-Mar-2012: First version
    * 15-Aug-2012: Corrected version, from author

Acknowledgements:
    Anthony Jones, Anthony.Jones(at)ias.u-psud.fr

References:
    Jones, Paper I,   2012A&A...540A...1J
    Jones, Paper III, 2012A&A...542A..98J, Cat. J/A+A/542/A98
(End)             Anthony Jones [IAS], Patricia Vannier [CDS]        16-Feb-2012