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| CD014 high-medium spectrum of 4th order Q-branch of C2H2. |
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| Line FWHM (pixels) of Q-branch lines with slit1-6 during CD014 |
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| Line FWHM (pixels) of Q-branch lines with slit1-6 during CD013 |
The plot above shows the spectral line FWHM we got from slits 1-6 in high-medium mode at 14um for CD013 and CD014.
Each point on the graph is for a particular spectral line and is the median value of FWHM in the spectral dimension. To convert from the Gaussian 1-sig width in the vertical dimension to FWHM in the spectral dimension, I multiplied by 2.355 x cos(28), where 28 deg is the typical slant of the lines in CD014.
The typical line slant in CD013 was 21 degrees
I calculated a new wavelength solution, using the positions of Q11-Q15 line centers (wavenums=[729.75,729.86,729.97,730.10,730.23]) and got 0.3647 km/s per pixel. In the previous cooldown, Matt calculated 0.3793 km/s per pixel for CD013 data.
More to come here, but it appears we're very close to, or surpassing R=100K with slit3, which I think was our goal.
1 comment:
I think the different tilt reflects the different flip mirror angles and how that rotated the slit as it hit the echelon.
The different velocity per pixel could represent the different focal position. My calculation assumed the focal length was 1m. The measured value corresponds to 0.96m.
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