1,770 reputation
620
bio website eutactic.wordpress.com
location Australia
age 29
visits member for 3 years, 10 months
seen May 17 at 1:08

grad student, computational quantum chemistry

Interests include chemistry, high performance computing, graphics, art, typesetting, programming (python, Java, C#, XAML)


Nov
25
awarded  Nice Question
Jul
2
awarded  Curious
Mar
24
awarded  Popular Question
Feb
12
awarded  Yearling
Sep
7
awarded  Enlightened
Sep
7
awarded  Nice Answer
Apr
27
comment Why does the metastable form of Technetium-95 have a longer half-life than its most stable state?
@ManishEarth, BenNorris - I respectfully submit that nuclear isomerism is far more nuclear physics than chemistry, taking place on energy and length scales orders of magnitude removed from chemical processes and not involving electronic structure. I've only ever seen it discussed in chemistry in the context of understanding Mössbauer spectroscopy. Whilst I apologise for being a bit presumptuous, I do think this question would attract a greater breadth and depth of answers on the physics site.
Apr
26
comment Why does the metastable form of Technetium-95 have a longer half-life than its most stable state?
Hopefully a moderator can shift this to phys.SE. Just surfing around tables of isotopes does however reveal that isomers that are longer-lived than their ground states are not uncommon (102mTc, 116mCs, etc.). Anyhow, this looks like another application of the difference between thermodynamic and kinetic stability. Intuitively, the decay pathways that lead to rapid decay of a ground-state isotope are less probable (maybe totally impossible) in an isomer. The isomer, whilst less thermodynamically stable, is stuck in a potential energy rut that it can only escape through slow processes.
Apr
5
awarded  Popular Question
Feb
12
awarded  Yearling
Jan
26
comment Have we managed to make a perfect vacuum?
@Hurricane - Antimatter can be stored in a Penning trap.
Jan
18
comment Do the energy levels of electron orbitals change relativistically?
Broadening of spectral lines occurs due to the Doppler effect (as well as a number of other effects) even in non-relativistic regimes. Otherwise emission and absorption spectra would be infinitely sharp. As a side note, you may be interested to know that relativistic mass increase becomes significant for bound electrons around about the second row of transition metals and quantum chemical calculations need to take it into account for accurate energy calculations.
Jan
17
answered Explanation of the Graetz circuit
Jan
16
comment How can two seas not mix?
@EmilioPisanty - It seems that Wikipedia has a page dedicated to the topic. Also, Atkins Physical Chemistry 3e pp. 632-634 talks about colloid stability.
Jan
16
answered How can two seas not mix?
Jan
5
comment Temperature below absolute zero?
Honest question - why is this in the news all of a sudden? I was under the impression negative absolute temperature was a fairly pedestrian phenomenon.
Jan
5
comment Is there something special in the visible part of electromagnetic spectrum?
I did rather drift off course, but I guess my point is that the visible part of the spectrum is only special for life due to its energy regime (and as you noted, that there's a high flux in the visible region from the sun). Its time-dependent bandwidth is irrelevant due to biological signalling being many many orders of magnitude slower. Time-independent bandwidth (i.e. this fruit is under/overripe due to its colour) is I believe a function of how many different photoreceptors we have and how specific they are. Most humans have 3, and are able to distinguish a wide range of colours.
Jan
5
answered Is there something special in the visible part of electromagnetic spectrum?
Jan
3
asked What reason(s) exist to suppose that all degeneracy pressures can be overcome in Black-Hole formation?
Dec
26
comment Calculating the speed of an object moving relative to another moving Object (Frame of reference)
This question doesn't really evince much research effort. Have you familiarised yourself with the Lorentz factor?