huber_1974
==========

M\. C\. E\. Huber and G\. Tondello, J\. Opt\. Soc\. Am\. 64, 390 \(1974\)

`Source record <https://github.com/LupoLab/optmat/blob/main/src/optmat/data/sources/huber_1974.toml>`__ · :doc:`Catalogue </the-data/sources>` · :doc:`Review register </register>`

DOI: `10\.1364/josa\.64\.000390 <https://doi.org/10.1364/josa.64.000390>`__

**Source kind:** measurement

**Recorded technique:** Wavelength shifts of about 30 emission lines \(argon ringing discharge\) in a windowless 3 m normal\-incidence spectrograph filled with helium near 700 Torr and evacuated in turn, measured against first\-order standards; more than 70 measurements of some 30 lines between 919 and 1910 A\.

**Materials in structured entries:** He

**Dataset quantities:** refractivity

**Contents:** 2 datasets; 0 formulas.

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

Table I lists values read from the best\-fit curve through the measurements, not the individual measurements \(which are shown only in Fig\. 1\)\. Pressure \(about 700 Torr, \+\-0\.03 %\) and temperature \(about 290 K, \+\-0\.07 %\) were measured and the data 'reduced to normal pressure and temperature \(NPT\)'; the paper does not say how, so the density convention is unknown \(for helium the real and ideal densities at 0 degrees C differ by 5e\-4, far below the 3 % uncertainty\)\. The standards' wavelengths in helium were computed from Mansfield & Peck's dispersion formula \(valid down to about 250 nm\)\.

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

Datasets
--------

huber\_1974/experiment
~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "experiment",
     "material": "He",
     "file": "He/huber_1974__experiment.csv",
     "table": "tbl_6b16f76840f9",
     "quantity": "refractivity",
     "scale": 1e-05,
     "abscissa_unit": "angstrom",
     "wavelength_medium": "vacuum",
     "state": "1atm_0C",
     "density": "unknown",
     "use": "primary",
     "uncertainty": {
       "relative": 0.03,
       "level": "probable error"
     }
   }

Smoothed best\-fit values at 92\-190 nm; 'probable error in the best\-fit curve smaller than \+\-3 %' \(p\. 391\)\.

huber\_1974/victor\_theory
~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: text

   {
     "id": "victor_theory",
     "material": "He",
     "file": "He/huber_1974__victor_theory.csv",
     "table": "tbl_6b16f76840f9",
     "quantity": "refractivity",
     "scale": 1e-05,
     "abscissa_unit": "angstrom",
     "wavelength_medium": "vacuum",
     "state": "1atm_0C",
     "density": "unknown",
     "use": "reproduced",
     "reproduced_from": [
       "G. A. Victor, A. Dalgarno and A. J. Taylor, J. Phys. B 1, 13 (1968); G. A. Victor (private communication)"
     ]
   }

The 'theoretical' column of Table I; the theory is 'expected to be accurate to about \+\-0\.5 %' \(p\. 390\)\.

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.