Calibration lamps often combine the output of excited Mercury (Hg) and Argon (Ar) gasses.  The scan above is of the

SPL-HGAR calibration lamp.

When excited, gasses produce light at specific lines as shown in the picture of the SPL-HGAR calibration lamp above.

See these links from NIST, the National Insitute of Standards and Technology for exact values:

Argon

Mercury

The source in guess #1 is an easily accessible, worldwide source for checking calibrations!

The spectral lines have very narrow bandwidth and with a high resolution spectrometer, would produce lines similar

to the picture on the calibration lamp above.  Zooming in on some of the smaller peaks reveals their wavelength location

from the spectrometer.  This gives an indication of the calibration of the spectrometer.  Cursor 0 is resting on top of a peak

at 772.3nm is really the 772.4 line from Argon showing that the SPM002-E spectrometer used to collect this data is calibrated.

Zooming in further onto one of the peaks and turning on the beam profile calculation indicates the peak position:

SPECSOFT calculates the peak at 750.5nm, very close to the 750.4nm Argon line.  The 2.16nm FWHM bandwidth

is an indication of the spectrometer resolution.  The SPM002-E has a measurement range of 200-1090nm with

a specified resolution of 0.8nm/2nm  (center/edge wavelengths). As shown above, the resolution of peak positions

is excellent!

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