I'm looking for the source giving quantatively numbers for o- and e-rays refraction indexes in the ice crystal depending on the wavelength.
Victor F. Petrenko, Robert W. Whitworth "Physics of Ice", OUP (1999) is worth a look - or preview at https://books.google.co.uk/books?id=oC941a8lXWIC&pg=PA219&lpg=PA219&dq=ice+birefringence
They reference Ehringhaus, who measured o- and e-ray refractive index between 405 nm and 691 nm, at temperatures -3.6, -65 and -110°C, with an accuracy at -3.6°C of around 0.0001.
A. Ehringhaus, Neues Jahrb. Mineral. Geol. Pareontol. Abt. B 41, 342 (1917).
https://scholar.google.com/scholar?hl=en&q=A.+Ehringhaus%2C+Neues+Jahrb.+Mineral.+Geol.+Pareontol.+Abt.+B+41%2C+342+%281917%29.
Is anything here
https://tinyurl.com/yc2cnchp
helpful, Aleksey? --Steve-
Thank you. So far I looked in Petrenko et al at once from Ehringhaus. Interesting that even if both no and ne exhibit spectral dependence the birefringence is constant.
Well, it is good to hear from you again, Aleksey! :-) It sounds as though you have done an interesting experiment that relates to the work published in 1957 by R.C. Emmons and R.M. Gates, which you can find at https://tinyurl.com/yd932t29 .
My own work explores the viability of abandoning the instruction "In the determination of the refractive indices of mineral grains by the immersion method, the grains must be in the extinction position, under which condition alone does the transmitted light have the value of one refractive index". Instead, I bring what I call a "fragment" (part of a crushed grain) to NO PARTICULAR ORIENTATION, before comparing its RI to that of the immersion liquid.
One of my primary goals has been ?simply? to discover whether statistically-significant data sets can be created from data derived by assessing whether each fragment encountered during a count is of Lesser, is Equal to, or is Greater than the RI of the immersion liquid (previously calibrated over the visible spectrum and the temperature range of the experiment: about 23°C to 60°C). Results confirm a success in creating statistically-significant data sets, but it is not so easy to say exactly what details are due to displays by any particular mineral/mineraloid/glass phase.
Nonetheless, in 2017 I took first place in the "Data Art" category of this https://www.lpl.arizona.edu/art/ contest, the winning image being available at https://tinyurl.com/yd994zpl . I did not place this year, with any of these https://tinyurl.com/y8h2w3ts entries. "Can't win 'em all." ;-)
In case you do not have it already, by standing permission of GSA I point you to a copy of R.C. Emmons's 1943 Chapter 5, GSA Memoir 8, "Double Variation Procedure for Refractive Index Determination": https://tinyurl.com/yabku63f . A copy of my dissertation can be found (at least for now) at https://tinyurl.com/y9bkao6n .
Work -- more recent than what I entered this year into the abovementioned art exhibition and contest -- has forced me again to seek a way to plot in 4D, after the plans I had to try to do that in 1994, as depicted at https://tinyurl.com/yaxrnzmv . Might you be able to help me with that graphics programming or know somebody who can?
I hope this response is helpful.
Sincerely, -Steve-
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