large wavelength range and list of x/y numerical data points of elements
I don't know about the IR spectra of metals. Certainly metals will have vibrational spectra, but I'm sure where to find it (if NIST does not have).

I can tell you how to get x/y data from NIST, if they have the spectrum.

For example, for benzoic acid. At the bottom of the page, there is a link to download the sepctrum in JCAMP-DX format. The .JDX file format is really a space-delimited text file containing x/y data with some markup at the front for the JCAMP plugin. 



See all that lovely x/y data? Force the .JDX file open in your favorite text editor, like notepad. Do not use a word processor - they will add additional markup. Do not use a spreadsheet program yet. Spreadsheets can open .JDX files, but they won't always choose the most helpful delineation. Once open in notebook, resave the file as a text (ascii) file. Make sure you type in the .txt to change the extension (alternately, you can just change the extension to .txt using any other means you may feel comfortable with). 

Now... open your favorite spreadsheet program, and use it to open your shiny new text file. You may have to tell the program to look for "all files" (MS Excel is bad about this). You should get some dialog/options on how to open the file. Choose "Delimited" if its an option, and when it comes time to choose your delimiters, make sure your choice includes "space":



Now you should have a file with the x/y data. The first column is wavenumber (at least for IR) and the second is transmission ($\frac{I_{\text{out}}}{I_{\text{in}}}$). Some of these files have more than one column of y-data. When I graphed each column from the benzoic acid file, I got the same spectrum (almost).