andrews_2016 ============ N\. L\. P\. Andrews, R\. Ross, D\. Munzke, C\. van Hoorn, A\. Brzezinski, J\. A\. Barnes, O\. Reich and H\.\-P\. Loock, Opt\. Express 24, 14086 \(2016\) `Source record `__ · :doc:`Catalogue ` · :doc:`Review register ` DOI: `10\.1364/oe\.24\.014086 `__ **Source kind:** measurement **Recorded technique:** In\-fiber Mach\-Zehnder interferometer in a hollow\-core photonic\-crystal fiber \(HC\-1550\-02\)\: the phase of the beat between core modes near 1532 nm recorded while the gas pressure in the fiber is varied from 0\.07 to 0\.6 bar, for nine gases\. **Materials in structured entries:** None recorded. **Dataset quantities:** None recorded. **Contents:** 0 datasets; 0 formulas. Curation notes -------------- Nothing is extracted\. The measurement gives the interferometric phase per unit pressure \(Fig\. 7, figures only\), which the paper converts to refractive index only through a calibration against literature polarizabilities \(Fig\. 9, with an instrument sensitivity coefficient f = 0\.0078\)\: it is not an independent determination of n\. Table 1 \(tbl\_9c65adc46529, image checked; the library's header cells are garbled but the numbers are correct\) lists only literature values\: 'alpha from n at 1532 nm' for He, Ar, N2 and C2H2, 'calculated using known dispersion and refractive indices' of Mansfield & Peck \(He\), Peck & Fisher \(Ar\), Peck & Khanna \(N2\), and static average polarizabilities from compilations \(units 1e\-40 J^\-1 C^2 m^2\), to three digits\. They are derived reproductions and are internally doubtful\: the 1532 nm values of Ar \(1\.74\) and N2 \(1\.95\) lie below the static values listed beside them \(1\.82, 1\.96\), whereas the dynamic polarizability must exceed the static one \(the static Ar value 1\.82 agrees with the known 1\.64 A^3 = 1\.826e\-40\)\. NH3, C2H2, CF4 and ClF2CH are not curated species\. **Recorded bibliographic identity status:** VALIDATED. This concerns identification of the source; it does not establish the scientific correctness of its contents. Datasets -------- No datasets are recorded. 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 ` for the checks and decisions.