| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| warren | "Hmm. I guess there are pros and cons to each approach. I agree that the 546 line doesn't result in a great linear calibration -- some end up about..." | Read more » | about 9 years ago | |||
| cfastie | "If the original Snowy Sky CFL is calibrated by pinning down the 436 nm and 546 nm peaks (using a macro) it looks like this: Most of the peaks do..." | Read more » | about 9 years ago | |||
| warren | "OK - I'm adapting the calibration slider to use the photoshop-corrected version of the Snow Sky spectrum. I read the blue 436 peak at 210px from l..." | Read more » | about 9 years ago | |||
| warren | "Would you be willing to try a recalibration using the 436/546 lines as a starting point? Would that be useful as a point of comparison? Also - I b..." | Read more » | about 9 years ago | |||
| cfastie | "That's a very important observation. Had I originally calibrated this spectrum on the 436 line and the 611 line (instead of 405 and 650), all the o..." | Read more » | about 9 years ago | |||
| warren | "If it's helpful, we can probably ask some of the OTK beta participants for one, since a couple have access to lab spectrometers. In your image/ima..." | Read more » | about 9 years ago | |||
| warren | "Oh, cool -- can you link us to your dissertation, as a source? I'm hoping this note can be a sort of bibliography for the calibration code decision..." | Read more » | about 9 years ago | |||
| gretchengehrke | "Ah, it makes sense why Hg(0) won't have a fluorescence line on compound fluorescent bulbs though: the liquid Hg(0) in the tube needs to be ionized ..." | Read more » | about 9 years ago | |||
| gretchengehrke | "I am absolutely positive that the most common forms of Hg are Hg(0) and Hg(II) -- my whole PhD is on mercury, specifically on Hg isotopes. The onl..." | Read more » | about 9 years ago | |||
| cfastie | "Hi Gwill, there do seem to be a lot of terbium peaks. I have not yet figured out how to know which of those peaks are expected in the light from a ..." | Read more » | about 9 years ago | |||
| warren | "Thanks, Gwill -- good resource. Chris, I wanted to get some more clarity from @gretchengehrke on the mercury oxidation states in the comments of m..." | Read more » | about 9 years ago | |||
| warren | "Hmm, is there a reason Hg (0) is not listed in the NIST spectra? Perhaps Hg (0) does not have any intense peaks? My list is filtered for most inten..." | Read more » | about 9 years ago | |||
| Guillaume123 | "Chris, Have you ever looked at "The Elements Spectra"; it gives you numerical values of the peaks, you can get it from: www.infini-t.com or email..." | Read more » | about 9 years ago | |||
| warren | "Don't we have an ocean optics spectrum to source from too? I don't remember if we took a cfl spectrum with it, but we could maybe ask Mary to take ..." | Read more » | about 9 years ago | |||
| gretchengehrke | "Oh, and clarification for my comment above: oxidation states are simply different common ions. Hg (0) is neutral, Hg (II) is short two electrons,..." | Read more » | about 9 years ago | |||
| gretchengehrke | "Hg (II), Hg (I), and Hg (0) are oxidation states of mercury. Hg (II) and Hg (0) are by far the most common forms of Hg in the environment -- Hg (I..." | Read more » | about 9 years ago | |||
| cfastie | "Now there is a new set of references. A newly corrected image (background) of the diffraction pattern of Snowy Sky CFL with emission lines shifte..." | Read more » | about 9 years ago | |||
| cfastie | "Correcting the diffraction pattern was done this way: marquee select lines and translate them left and right? This was done in the Photoshop file..." | Read more » | about 9 years ago | |||
| warren | "I see that the 14 peaks you've chosen are sourced from the NIST data, not the Wikipedia/Ocean Optics data. OK, one last issue -- for intensities o..." | Read more » | about 9 years ago | |||
| warren | "Also, I'm not clear what Hg II means -- an ion? Would we only be seeing Hg I, or would we see both? I'm wondering about the Hg I line at 546.0750nm..." | Read more » | about 9 years ago | |||
| warren | "OK, I've filtered out the highest NIST peaks, and exported them in plain text. But these are in a vacuum, and for example, the 436.6nm line in the ..." | Read more » | about 9 years ago | |||
| warren | "Oh, and is the 14CFLpeaks.txt from the Wikipedia reference? If so, it says: Spectrum with peaks labelled taken with an Ocean Optics HR2000 spectro..." | Read more » | about 9 years ago | |||
| warren | "OK, so we have two different needs: First, a list of known spectral peaks: from some known trusted maybe an external source, like NIST? we only ..." | Read more » | about 9 years ago | |||
| cfastie | "I did a check on the files I attached to the last comment and they are not as precise as I thought they would be. A graph of the data file of int..." | Read more » | about 9 years ago |