Journal article Open Access

Using helium as a standard of refractive index: Correcting errors in a gas refractometer

Stone, Jack A.; Stejskal, Alois

MARC21 XML Export

<?xml version='1.0' encoding='UTF-8'?>
<record xmlns="">
  <datafield tag="540" ind1=" " ind2=" ">
    <subfield code="u"></subfield>
    <subfield code="a">Creative Commons Zero v1.0 Universal</subfield>
  <datafield tag="260" ind1=" " ind2=" ">
    <subfield code="c">2004-04-18</subfield>
  <controlfield tag="005">20190409134331.0</controlfield>
  <controlfield tag="001">1235712</controlfield>
  <datafield tag="909" ind1="C" ind2="O">
    <subfield code="p">openaire</subfield>
    <subfield code="o"></subfield>
  <datafield tag="520" ind1=" " ind2=" ">
    <subfield code="a">The refractive index of helium at atmospheric pressure can be determined from ab initio calculations in combination with careful pressure and temperature measurements. Therefore, helium can serve as a theory-based standard of refractive index; it might be used as a medium of known refractive index for high-accuracy interferometric length measurements or it can be used to characterize and correct errors in a gas refractometer. We have used helium to correct for pressure-induced distortions of two refractometers built by us, where both refractometers basically consist of a laser locked to the transmission maximum of a simple Fabry–Perot cavity. As a proof-of-principle of the helium-correction technique, we have used our device to measure the molar refractivity of nitrogen and we find reasonable agreement with previous measurements. When our two refractometers simultaneously measure the refractive index of a common nitrogen sample, we find that the two systems agree with each other within a few parts in 109.</subfield>
  <datafield tag="700" ind1=" " ind2=" ">
    <subfield code="a">Stejskal, Alois</subfield>
  <datafield tag="856" ind1="4" ind2=" ">
    <subfield code="s">135278</subfield>
    <subfield code="z">md5:03d1064dd8964a445acef42e80c6e4c1</subfield>
    <subfield code="u"></subfield>
  <datafield tag="542" ind1=" " ind2=" ">
    <subfield code="l">open</subfield>
  <datafield tag="980" ind1=" " ind2=" ">
    <subfield code="a">publication</subfield>
    <subfield code="b">article</subfield>
  <datafield tag="100" ind1=" " ind2=" ">
    <subfield code="a">Stone, Jack A.</subfield>
  <datafield tag="024" ind1=" " ind2=" ">
    <subfield code="a">10.1088/0026-1394/41/3/012</subfield>
    <subfield code="2">doi</subfield>
  <datafield tag="245" ind1=" " ind2=" ">
    <subfield code="a">Using helium as a standard of refractive index: Correcting errors in a gas refractometer</subfield>
  <datafield tag="650" ind1="1" ind2="7">
    <subfield code="a">cc-by</subfield>
    <subfield code="2"></subfield>
Views 63
Downloads 17
Data volume 2.3 MB
Unique views 61
Unique downloads 17


Cite as