luna_physdata
=============

Luna\.jl, src/PhysData\.jl \(https\://github\.com/LupoLab/Luna\.jl\), branch modal\-fixed and PR \#425

`Source record <https://github.com/LupoLab/optmat/blob/main/src/optmat/data/sources/luna_physdata.toml>`__ · :doc:`Catalogue </the-data/sources>` · :doc:`Review register </register>`

No DOI is recorded.

**Source kind:** fit

**Recorded technique:** Dispersion formulas used by Luna that have no publication of their own\.

**Materials in structured entries:** Ar, He, Kr

**Dataset quantities:** None recorded.

**Contents:** 0 datasets; 4 formulas.

Curation notes
--------------

Legacy models, kept to compare Luna's and solprop's choices with the data\. Luna evaluates every Sellmeier gamma as n^2 \- 1 at 0 degrees C and 1 bar divided by the real\-gas density there \(dens\_1bar\_0degC\), whatever state the source used \(LB\-106 to LB\-108 in solprop's LUNABUGS\.md\); the entries here keep Luna's own reference state\.

The argon fit \(Luna commit 56cc3ab, C\. Brahms, 2025\-10\-02, 'improved argon ref index'\) and the krypton fit \(PR \#425, T\. Grigorova\) are three\-term fits of the same form as Ermolov's helium formula to Kingston's \(1964\) vacuum\-ultraviolet values joined to Borzsonyi et al\.'s \(2008\) visible and near\-infrared formula; their construction is described only in PR \#425's notebook\. solprop found the krypton fit's ratio to Borzsonyi to be the 1 atm / 1 bar density ratio and so references it to 1 atm; both readings are recorded\.

Datasets
--------

No datasets are recorded.

Formulas
--------

luna\_physdata/jct\_He
~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "jct_He",
     "material": "He",
     "equation": "PhysData.jl, sellmeier_gas(:He), gamma_JCT",
     "printed": "B1 2.16463842e-05, C1 -6.80769781e-04, B2 2.10561127e-07, C2 5.13251289e-03, B3 4.75092720e-05, C3 3.18621354e-03",
     "variable": "lambda: wavelength in um",
     "form": "n2_sellmeier",
     "terms": {
       "B": [
         "2.16463842e-05",
         "2.10561127e-07",
         "4.75092720e-05"
       ],
       "C": [
         "-6.80769781e-04",
         "5.13251289e-03",
         "3.18621354e-03"
       ]
     },
     "state": "1bar_0C",
     "density": "real",
     "range_nm": [
       90.0,
       1000.0
     ],
     "kind": "legacy"
   }

Ermolov et al\. \(2015\) with the coefficients to more digits; Luna's default helium\.

luna\_physdata/kingston\_fit\_Ar
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "kingston_fit_Ar",
     "material": "Ar",
     "equation": "PhysData.jl, sellmeier_gas(:Ar), gamma_JCT, commit 56cc3ab",
     "printed": "B1 0.00032323117217767093, C1 0.0045416501944977915, B2 0.00011557814904827939, C2 0.011120847461156543, B3 0.00010909808164540697, C3 0.0006827046691889898",
     "variable": "lambda: wavelength in um",
     "form": "n2_sellmeier",
     "terms": {
       "B": [
         "0.00032323117217767093",
         "0.00011557814904827939",
         "0.00010909808164540697"
       ],
       "C": [
         "0.0045416501944977915",
         "0.011120847461156543",
         "0.0006827046691889898"
       ]
     },
     "state": "1bar_0C",
     "density": "real",
     "range_nm": [
       110.0,
       1000.0
     ],
     "kind": "legacy"
   }

Luna's default argon since 56cc3ab; solprop's 'kingston' argon source\. 110 nm is PR \#425's phase\-matching limit for argon\.

luna\_physdata/kingston\_fit\_Kr\_1bar
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "kingston_fit_Kr_1bar",
     "material": "Kr",
     "equation": "PR #425, sellmeier_gas(:Kr), gamma_JCT",
     "printed": "B1 7.156207185088921e-6, C1 0.016126479267946525, B2 0.00023020614937540427, C2 0.01348822574907029, B3 0.000604323109684193, C3 0.004204161467601559",
     "variable": "lambda: wavelength in um",
     "form": "n2_sellmeier",
     "terms": {
       "B": [
         "7.156207185088921e-6",
         "0.00023020614937540427",
         "0.000604323109684193"
       ],
       "C": [
         "0.016126479267946525",
         "0.01348822574907029",
         "0.004204161467601559"
       ]
     },
     "state": "1bar_0C",
     "density": "real",
     "range_nm": [
       130.0,
       1000.0
     ],
     "kind": "legacy"
   }

As Luna PR \#425 evaluates it \(divided by the 1 bar density\)\.

luna\_physdata/kingston\_fit\_Kr\_1atm
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "kingston_fit_Kr_1atm",
     "material": "Kr",
     "equation": "PR #425, sellmeier_gas(:Kr), gamma_JCT, referenced to 1 atm",
     "printed": "as kingston_fit_Kr_1bar",
     "variable": "lambda: wavelength in um",
     "form": "n2_sellmeier",
     "terms": {
       "B": [
         "7.156207185088921e-6",
         "0.00023020614937540427",
         "0.000604323109684193"
       ],
       "C": [
         "0.016126479267946525",
         "0.01348822574907029",
         "0.004204161467601559"
       ]
     },
     "state": "1atm_0C",
     "density": "real",
     "range_nm": [
       130.0,
       1000.0
     ],
     "kind": "legacy"
   }

solprop's reading \(sellmeier\.py\)\: the fit's ratio to Borzsonyi is 1\.01307\-1\.01343, the 1 atm / 1 bar density ratio\.

Corrections
-----------

No dataset errata are recorded in this source record.

Formula corrections, where recorded, appear with their formulas above. Curation notes may also discuss corrections or unresolved interpretation. Consult the :doc:`review register </register>` for the checks and decisions.