17-Jul-2014, MF
Hg(Ar) & Ar Oriel pen lamps

From the Oriel Spectral Calibration Lamps booklet:
"The Hg(Ar) and Hg-Ne lamps contain a small amount of mercury which
dominates the output spectrum, and argon or neon as a starter gas.
The spectral output of the 6035 Hg(Ar) lamps is effectively that of
the mercury lines."

SAFETY CONSIDERATIONS: "Although low power, these lamps emit intense UV,
... wear UV protective eyewear and gloves when operating them."

The other Oriel pen lamps are "rare gas" lamps: Ar, Ne, Kr, Xe
Hg has a one BIG UV emission at 253.7 nm,
and less intense but big lines at 296.7, 312.6 nm.

From the NIST Atomic Spectra Database
Observed Wavelength Air (nm),
Relative Intensity
Hg I 253.6521 15,000
Hg I 296.7283  1,200
Hg I 312.5674    400
Hg I 313.155     320
Hg I 314.1844    320

Note:
These UV lines are below the spectral range of MOS2, however,
Lu MOS sees second order (2X wavelength) of these - via a Spectralon
integrating sphere - MOBY Lu does not see these.

253.6521 * 2 = 507.3042 nm = BIG
296.7283 * 2 = 593.4566 nm = @ left shoulder of Reflection Peak
312.5674 * 2 = 625.1348 nm = BIG
313.155  * 2 = 626.31   nm
314.1844 * 2 = 628.3688 nm

Maybe these second order lines could be used for wavelength
calibration?  Or, are they also doubled in line width?

Since our Ekspla NT242 laser's lowest wavelength is 300 nm,
on 15-Jul-2014, via MOS204cfg15 Lu & Spectralon sphere I scanned
300 nm Ekspla output, seen by Lu MOS BSG at 600 nm
312.55, 313.15, 313.20 nm, seen by MOS ~ 626 nm,
317.50 nm, seen by MOS at end of BSG at 635 nm.

For MOS/MOBY wavelength calibrations I have scanned Hg(Ar) pen lamp -
assuming it's output contained both Hg and Ar lines.  I did not scan
the Ar lamp.  From the NIST ASD I used listings for lines of Hg and Ar
to retrieve wavelengths for the Hg(Ar) scans.

On 16-Jul-2014, via MOS204cfg15 Lu & Spectralon sphere I scanned our
Ar Oriel pen lamp.
There are two lines in the Hg spectrum 404.6565 & 546.0750 nm,
which should not be used from the Hg(Ar) lamp for BSG calibration
because they are really doubles from the Ar spectrun at
404.4418 & 545.1652 nm.

There are several RSG lines from the Hg(Ar) lamp which I have been
using for wavelength calibrations which are from the Ar spectrum, and
are really multiple-lines, and should not have been used:
I've used 675.28 nm, which is a triple line from 675.2834, 675.6163,
676.6612 nm
706.67 is a double: 706.7218, 706.8736 (maybe the ".67" was a typo?)
714.7  is a double: 714.7042, 715.8839
727.29 is a triple: 726.5172, 727.0664, 727.2936
738.4  is a triple: 737.2118, 738.3980, 739.2980

The Ar lamp has 17 BSG lines which to not appear in the output of
the Hg(Ar) lamp
(which will be especially useful for nUV wavelength calibration):

355.4306, 360.6522, 383.4679, 430.0101, 459.6097, 462.8441, 518.7746,
522.1271, 542.1352, 545.1652, 560.6733, 565.0704, 573.9520, 583.4263,
586.0310, 591.2085, 614.5441 nm.

Note: the Ar 404.4418 line causes the Hg 404.6565 to be a double in the
Hg(Ar) output, but the Ar 404.4418 is a single in the Ar output.
Ditto the Ar 545.1652 and Hg 546.0750 lines.

Maybe I will use only the Hg I NIST lines from Hg(Ar) lamp,
and use Ar I NIST lines from the Ar lamp - i.e. drop the RSG Ar lines
from the Hg(Ar) useful set ?