Comment on exploding wire and electron beam vaporization studies of electric polarizabiltiies
Dynamic dipole polarizability of gold and copper atoms for 532- and 1064-nm wavelengths
https://www.researchgate.net/publication/330219250_Dynamic_dipole_polarizability_of_gold_and_copper_atoms_for_532-_and_1064-nm_wavelengths/comments
I wrote to Gennady Sarkisov on ResearchGate about your work just now. I was reading his Jan 2019 paper “Dynamic dipole polarizability of gold and copper atoms for 532- and 1064-nm wavelengths” at
https://www.researchgate.net/publication/330219250_Dynamic_dipole_polarizability_of_gold_and_copper_atoms_for_532-_and_1064-nm_wavelengths/comments and left him this comment.
——————– My comment on ResearchGate ———————————–
I just happened to chat with Agustin Cruz, and others, yesterday about his electron beam 3D printer. Here is a description of his work at https://hackaday.io/project/183736-3d-metal-printer
The transcript of our chat is at https://hackaday.io/event/184160-metal-3d-printing-hack-chat/log/203868-hack-chat-transcript-part-1
And a video of his printer in operation is at https://www.youtube.com/watch?v=hnYU1hB2ZDA
You are vaporizing a fairly substantial amount of material with your exploding wire. His electron beam is 100 Watts. The important parameter for data gathering is beam intensity, not total current. You have to do things in nanoseconds or smaller. His device could give you leisure to follow a continuous line of vaporized metal as long as you like. He said he can use it as a microscope as well. So you can correlate the track shape after the fact with the recorded spectrum, voltage, current and transmitted stress (sensors on the material as it is being scanned). That should give you plenty to work with.
I was re-reading Keith Bonin and Vitaly Kresins “Electric Diplole Polarizabilities of Atoms, Molecules and Clusters” this evening when I decided to see who might be doing electric quadrupole work. It is not quite the desert you indicate, but the data and methods and such ARE very scattered and disorganized. I mention this, because ALL orders of the polarizability could be documented in a consistent manner, open to all, and used for calibration and inter-group collaborations.
If it were me, I would set the beam scanning over gold, aluminum, copper, tungsten, vanadium, tantalum, cobalt, beryllium, boron, carbon, silicon nitride, wood, proteins, plastics, rubbers, coal and other common materials. Document their emissions (for monitoring and identification during metal forming) and for characterizing unknown materials in an online shared database open to all. Run some continuously as a resource for global collaboration, training and algorithm development.
Agustin might be able to do that as a service to support his work on 3D electron beam metal forming.
Richard Collins, Director, The Internet Foundation
