| Author | Message | ||
     Howard Mark (hlmark) Senior Member Username: hlmark Post Number: 215 Registered: 9-2001 |
I'd forgotten about this, but Emil just reminded me that Ron Rubinovitz has measured spectra of several organic salts, possibly some in solution, too. Also Chris Brown of Univ of R.I. has spectra of inorganics. Both of the above people have proven very helpful, in sharing their spectra. In addtion, the USGS (US Geologic Survey) has a web site containg spectra. The following is the descriptive text from the site, and includes the link: This listing of spectra is from: http://speclab.cr.usgs.gov/spectral.lib06 USGS Digital Spectral Library 06 http://speclab.cr.usgs.gov/spectral.lib06 Researchers at the Spectroscopy Lab have measured the spectral reflectance of hundreds of materials in the lab, and have compiled a spectral library. The library is used as a reference for material identification in remote sensing images. This web page provides links to the splib06* series of spectral library data and supporting information. The following links to the official Data Series 231 report and includes the description of how spectra were measured, sample purity, full sample descriptions, plots of the spectra, and ASCII listings of all data. Clark, R.N., Swayze, G.A., Wise, R., Livo, E., Hoefen, T., Kokaly, R., Sutley, S.J., 2007, USGS digital spectral library splib06a: U.S. Geological Survey, Digital Data Series 231. -------------------------------------------------------------------------------- You can interactively browse individual spectra from the digital library online, or view the sample descriptions and customized plots online. Spectral Library Detailed Plots and Sample Descriptions -------------------------------------------------------------------------------- The software used to analyze the laboratory data and manage the spectral library is Specpr You can download the spectral library in any of the following formats: Original Laboratory Data: splib06a - ftp Compressed Binary (25 MBytes) (all spectra and original descriptions) Specpr Format splib06a - ftp Compressed ASCII (48 MBytes) (all spectra and original descriptions) Spectral Library SAMPLE DESCRIPTIONS ftp Compressed tar file of ASCII format (21 MBytes) (all spectral data and original descriptions). Original Descriptions only - ftp tar file of sample descriptions (291 MBytes, does not compress). Original Descriptions only - ftp tar file of spectral plots (29 MBytes, does not compress). ftp directory of individual ASCII files of original spectral data and sample descriptions. ftp directory containing all Spectral libraries as ASCII files (All original and convolved libraries; for specific libraries it might be easier to select from the table below). ftp directory of individual sample description files ftp directory of individual spectral plot files (gif images of plots) Interpolated Laboratory Data: (It is suggested that if you are going to convolve the spectral library to your own systems, use this version. This is the version we use for convolutions. The higher sampling helps when doing numerical integrations, so it could be used for all applications. ftp directory where splib06b can be found. -------------------------------------------------------------------------------- Along with the main library, splib06a, at the original instrument resolution, there are versions for specific flight instruments flying throughout the solar system such as the NASA/JPL Airborne Visual and Infra-Red Imaging Spectrometer (AVIRIS), Cassini VIMS, and more. ftp directory where Convolved Spectral Libraries can be found. -------------------------------------------------------------------------------- U.S. Geological Survey, a bureau of the U.S. Department of the Interior This page URL= http://speclab.cr.usgs.gov/spectral.lib06 This page is maintained by: Dr. Roger N. Clark [email protected] USGS Privacy Statement|| Disclaimer|| Accessibility Last modified April 26, 2008. Hope some of this helps \o/ /_\ | ||
| Howard Mark (hlmark) Senior Member Username: hlmark Post Number: 214 Registered: 9-2001 |
Formic acid itself should have a different spectrum than the formate ion, but in solution, to the extent that the acid dissociates, we can expect the formate ions to have the same spectrum regardless of the source. I think both Lois and I were thinking of the spectrum of the pure material, which is what is in the various collections of spectra. I have agree with her now, you'll have the measure the spectra yourself, I think, or find someone who can do it for you. \o/ /_\ | ||
| Jerry Jin (jcg2000) New member Username: jcg2000 Post Number: 5 Registered: 1-2009 |
I am looking for NIR reference spectra of aqueous organic salts, unless aqueous formic acid solution had the same spectrum as the aqueous sodium formate... | ||
| Lois Weyer (lois_weyer) Advanced Member Username: lois_weyer Post Number: 24 Registered: 7-2002 |
Hi Howard, He was looking for acid salts, not acids or acid esters or aldehydes. I think that Jerry and I have skipped acid salts. I don't have the 3-volume set, but we did not mention acid salts in our joint book. | ||
| Howard Mark (hlmark) Senior Member Username: hlmark Post Number: 213 Registered: 9-2001 |
Lois - leafing through the index for the Handbook of Organic Compounds (Jerry Workman's 3-volume set) more-or-less at random, I found butyric acid, iso-butyric acid, 2-ethyl butyric acid, 2-ethyl hexanoic acid, formaldehyde, proprionaldelyde, benzaldehye, propionic acid, and others - - and that was just in the first two pages. I think you're looking in the wrong place, that Handbook seems likely will reward a careful perusal. \o/ /_\ | ||
| Lois Weyer (lois_weyer) Advanced Member Username: lois_weyer Post Number: 23 Registered: 7-2002 |
Good question. I don't see any formic, acetic, butyric or propionic acid salt NIR spectra in either the Sadtler or the Buback/Vogele NIR collections. Why don't you get some and scan it? Or maybe someone can scan it for you. | ||
| Jerry Jin (jcg2000) New member Username: jcg2000 Post Number: 4 Registered: 1-2009 |
and spectra of other organic salt. I tried NIST Webbook and hit none. |