willetts_1982
=============

D\. V\. Willetts and M\. R\. Harris, J\. Phys\. D\: Appl\. Phys\. 15, 51 \(1982\)

`Source record <https://github.com/LupoLab/optmat/blob/main/src/optmat/data/sources/willetts_1982.toml>`__ · :doc:`Catalogue </the-data/sources>` · :doc:`Review register </register>`

DOI: `10\.1088/0022\-3727/15/1/007 <https://doi.org/10.1088/0022-3727/15/1/007>`__

**Source kind:** measurement

**Recorded technique:** Interferometer at 10\.59 um with a 1\.0 m cell terminated in KCl windows, fringes counted with a pyroelectric detector as gas was removed from or admitted to the cell \(p\. 10\); part of a study of the frequency sweeping of a hybrid TEA CO2 laser\.

**Materials in structured entries:** CO2, He, N2

**Dataset quantities:** refractivity

**Contents:** 3 datasets; 0 formulas.

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

Table 2 \(p\. 10, image checked\) gives the refractivity and the Gladstone\-Dale constant K of He, N2, CO2 and He\:N2\:CO2 mixtures at 10\.59 um\. The state is the text's \(p\. 10\)\: 'for p = 103 kPa, T = 19 C'; the caption's '1\.03 kPa' is a misprint \(the refractivities are of order the 1 atm values; TC\-149\)\. The density reduction is not stated; at this precision \(2\.5\-6 %\) the difference between ideal and real gas is immaterial, and ideal is recorded\. The wavelength is the CO2 laser's 10\.59 um, taken as vacuum \(the air\-vacuum difference, 3e\-4, is below the precision\)\. The mixtures \(a check of additivity; three calculated\) and K are not extracted\. The uncertainties are the printed \+\-, level not stated\.

**Recorded bibliographic identity status:** VALIDATED\_WITH\_WARNINGS. This concerns identification of the source; it does not establish the scientific correctness of its contents.

Datasets
--------

willetts\_1982/measured\_He
~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "measured_He",
     "material": "He",
     "file": "He/willetts_1982__measured_He.csv",
     "table": "tbl_5618cf9a9efd",
     "quantity": "refractivity",
     "scale": 1e-06,
     "abscissa_unit": "um",
     "wavelength_medium": "vacuum",
     "state": {
       "pressure_pa": 103000.0,
       "temperature_c": 19.0
     },
     "density": "ideal",
     "use": "check",
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table 2 \(a\), the pure gas \(volumetric ratio 1\:0\:0\)\: \(n \- 1\) x 10^6 at 10\.59 um\. A check\: its 2\.5\-6 % uncertainty is far larger than the other data's\.

willetts\_1982/measured\_N2
~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "measured_N2",
     "material": "N2",
     "file": "N2/willetts_1982__measured_N2.csv",
     "table": "tbl_5618cf9a9efd",
     "quantity": "refractivity",
     "scale": 1e-06,
     "abscissa_unit": "um",
     "wavelength_medium": "vacuum",
     "state": {
       "pressure_pa": 103000.0,
       "temperature_c": 19.0
     },
     "density": "ideal",
     "use": "check",
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table 2 \(a\), the pure gas \(volumetric ratio 0\:1\:0\)\: \(n \- 1\) x 10^6 at 10\.59 um\. A check\: its 2\.5\-6 % uncertainty is far larger than the other data's\.

willetts\_1982/measured\_CO2
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "measured_CO2",
     "material": "CO2",
     "file": "CO2/willetts_1982__measured_CO2.csv",
     "table": "tbl_5618cf9a9efd",
     "quantity": "refractivity",
     "scale": 1e-06,
     "abscissa_unit": "um",
     "wavelength_medium": "vacuum",
     "state": {
       "pressure_pa": 103000.0,
       "temperature_c": 19.0
     },
     "density": "ideal",
     "use": "check",
     "uncertainty": {
       "column": true,
       "level": "not stated"
     }
   }

Table 2 \(a\), the pure gas \(volumetric ratio 0\:0\:1\)\: \(n \- 1\) x 10^6 at 10\.59 um\. A check\: its 2\.5\-6 % uncertainty is far larger than the other data's\.

Formulas
--------

No formulas are recorded.

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.