Technical Interests
Science is fun! David F Hakala's Website
Technical Interests
Science is fun! David F Hakala's Website
Primarily laser photochemistry, chemical kinetics, and computational chemstry. Chemistry of planetary atmospheres and comets.
The possibilities of being able to actually simulate real quantum processes will lead to great things.
I have added a number of technical notes on Neutral Atom Quantum Computing to the LCD and LCoS downloads sectrion
Plasma makes up over 99% of the Universe. It is our best shot at getting a clean energy source to address Climate Change issues. One of my thesis advisors first observed nuclear fusion with Lord Rutherford and Sir Mark Oliphant in 1933.
Analytical methods, luminescent materials, photoresists, PVA chemistry, Electrodepsosition, vacuum deposition
From Color CRT's to LCD's to Microdisplays interested in the device chemistry and physics and the manufacturing processes.
Batteries are critical for many things. My ineterest is mostly to how our Smart Infrastructure and IoT works for extended periods of time.
Molecular Qubits are a truly interesting subject. They are related to the topic of Quantum Computing in that they are a molecular scale implementation of a qubit. The energy levels of the molecule provide the basis for the qubit. Energy levels must be different enough so that they can be manipulated and read without confounding the resul
Molecular Qubits are a truly interesting subject. They are related to the topic of Quantum Computing in that they are a molecular scale implementation of a qubit. The energy levels of the molecule provide the basis for the qubit. Energy levels must be different enough so that they can be manipulated and read without confounding the results with data from undesired energy levels. Typically, but not exclusively the spin of a molecule is used. In a magnetic field the energy of these levels separates and the resulting can be used as a qubit. This subject combines spectroscopy (optical and microwave) with computational chemistry, molecular design and synthesis, and quantum information processing.
In this section I am adding an update of a paper I originally wrote in 1976 about photochemical separation of isomeric nuclides to see if one could obtain a population inversion. I added a second technical note about how gamma ray lasers operate and some of the challenges and possibilities. I added a couple of papers to the DFH Paper down
In this section I am adding an update of a paper I originally wrote in 1976 about photochemical separation of isomeric nuclides to see if one could obtain a population inversion. I added a second technical note about how gamma ray lasers operate and some of the challenges and possibilities. I added a couple of papers to the DFH Paper download section.
Here are the abstracts:
The current author (D.F.Hakala) drafted the original manuscript in 1976 with the other authors. George C.Baldwin was in the Nuclear Engineering Department, and it was his interest in gamma ray lasers (GRASERs) that inspired me to suggest the paper. I was taking a course in Nonlinear Optics and Application from George at the time. He had discussed the possibility, and some concepts of, gamma ray lasers. In part of my thesis, I had done some work showing that I had obtained an isotope separation in 18O using two step photodissociation in Nitrogen Dioxide. Herbert Clark was an undergraduate instructor for me in Physical Chemistry and Nuclear Chemistry and Physics. Robert R Reeves was my Ph.D. thesis advisor. My thesis work had been essentially completed after my second year in graduate school, and I was polishing it up in my third year and doing other projects of interest. Before the paper was completed, I graduated and left to start my first job with RCA. George finished off the paper and presented it in 1978. I had always wanted to finish the paper myself, but I had other priorities. Recently, going through some of my old school notebooks I had saved I came across the draft I had written and decided to finish it now. After covering the basics behind the reasons for spectral differences in a nuclear isomer from its ground state. I then have sections on both bromine-80m and mercury 197m. Bromine is now Section 4.1 and Section 4.2 now covers mercury-197m. Spectra are reproduced from literature values and line broadening by a) natural radiative lifetime, b) doppler shift broadening, and c) the Lorentzian broadening due to collisions(pressure). The spectra and estimated linewidth under various experimental conditions are examined to determine likelihoods of a photochemical separation. Although it was a possible physical option, I did not consider photoionization. In both cases some consideration is given as to how subsequent chemical reaction of the excited species could be used to provide a physical separation of the isomeric nuclides. The original 1976 primary arguments are kept; Section 7 separates what has been learned since. Estimated quantities are labeled as such.
A gamma-ray laser (graser) would amplify recoilless (Mössbauer) gamma rays by stimulated emission from inverted nuclei. Nothing in physics forbids it, but after 65 years none has been built, for one central reason, the “graser dilemma”: the narrow line that gives a nuclear transition its huge cross section survives only in a cold, undamaged crystal, while any pump strong enough to invert the nuclei inside their lifetime deposits tens to millions of times the energy that melts that crystal. X-ray lasers exist because they avoid the nuclear problem entirely: free-electron lasers need no inversion, and inner-shell atomic lasers are pumped by an x-ray laser on femtosecond time scales. The most likely path is therefore not a stand-alone nuclear laser but a hybrid: an x-ray free-electron laser, in future a narrow-band cavity-based one, drives Mössbauer nuclei such as ⁵⁷Fe (14.4 keV) or ⁴⁵Sc (12.4 keV) coherently, with the nuclei supplying the narrow line and, eventually, gain. A self-contained isomer graser would still need a separated, triggerable isomer; that is where the isomer-separation work of the companion paper fits.
In this section I am adding an update of a paper I originally wrote in 1976 about photochemical separation of isomeric nuclides to see if one could obtain a population inversion. I added a second technical note about how gamma ray lasers operate and some of the challenges and possibilities.
Files coming soon.
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