| Author | Message | ||
     Art Springsteen (artspring) Junior Member Username: artspring Post Number: 8 Registered: 2-2003 |
Hello Kathryn, If you go to our website, a spectral plot of the packed powder wavelength calibration is shown. The url is http://www.aviantechnologies.com/products/standards/reflect.php#reflectanceWavelength I hope this proves useful. Best regards, Art Springsteen | ||
| kathryn lee (kathrynlee) Junior Member Username: kathrynlee Post Number: 8 Registered: 2-2004 |
Perhaps my question was unclear. I wanted a resource for spectra of various rare-earth oxides, not the materials themselves. I want to see the spectra so I can see where they absorb in the 400-2500 nm region, or at least the 400-1100 nm region. | ||
| Art Springsteen (artspring) Junior Member Username: artspring Post Number: 7 Registered: 2-2003 |
Hello all, I must correct Howard. NIST will no longer perform this calibration. We now supply SRM 1920a (coir part # is WC-PP-1920a). It is the same size but has improved construction over the original SRM-1920a, which had the unfortunate problem of the separation of the powder. You might be able to get the your standard calibrated at NRC if you require a National Laboratory calibration directly. It is a special calibration that has to be requested. NPL in the UK used to also do this but they have changed greatly over the past few years and while I have talked to Peter Wooliams recently (the new head of the group that does such measurements), I have not asked him about this particular calibration. The data for SRM-1920a is available on-line by accessing NIST Special Publication 250-48. Best regards, Art Springsteen Avian Technologies LLC www.aviantechnologies.com | ||
| Howard Mark (hlmark) Senior Member Username: hlmark Post Number: 199 Registered: 9-2001 |
Kathryn - both Deepak and Michael are correct. Since your question was about spectra for rare earth oxides, the information from the NIST certificate may be enough. I have a copy of that myself. If you need the actual material, several commercial suppliers can provide that, with NIST-traceability. You can also make up your own mixture and NIST can certify it for you. \o/ /_\ | ||
| Michael C Mound (mike) Senior Member Username: mike Post Number: 57 Registered: 7-2007 |
Deepak, If you check today, you will find that though you can access the Certificate for SRM 1920a, the NIST actual material standard is not available for sale. Best regards, Mike | ||
| Deepak Sharma (deepak) New member Username: deepak Post Number: 4 Registered: 11-2007 |
Yes, One can have SRM 1920a or other from NIST as a source of NIR Spectra for rare earth oxides. | ||
| kathryn lee (kathrynlee) Junior Member Username: kathrynlee Post Number: 7 Registered: 2-2004 |
Does anyone know of a searchable resource of NIR spectra for rare-earth oxides? |