Questions tagged [quantum mechanics]

Sara Mon Feb 03 2025 | 6 answers 1660

The Fermion Wick's theorem, proposed by Gian Carlo Wick, is a fundamental principle in quantum field theory. It provides a method to convert the product of creation and annihilation operators into a sum of their normal-ordered products and corresponding contractions, which finds important applications in Green's function methods and Feynman diagrams.

SeoulSoul Wed Oct 30 2024 | 5 answers 1317

I'm curious about the numerical value of the physical constant hbar, which is often encountered in quantum mechanics. Could you please tell me what it is?

ShintoMystery Fri Oct 11 2024 | 5 answers 1179

I'm trying to understand the 3% rule in the context of QM. Could someone explain what this rule is and how it applies to quality management?

Sara Sat Oct 05 2024 | 5 answers 791

Could you please elaborate on the Hund rule of exchange energy? I'm curious to understand the fundamental concept behind it and how it applies to the world of chemistry and physics. Is it related to the behavior of electrons in atoms or molecules? How does it help us predict the stability of certain chemical species? I'm eager to learn more about this intriguing aspect of quantum mechanics.

PulseRider Sun Sep 29 2024 | 0 answers 0

Could you please explain in simple terms what the parallel spin rule is all about? I've heard it mentioned in the context of quantum mechanics, but I'm not entirely sure how it applies or what its significance is. Is it related to the behavior of particles or some other aspect of physics? And what makes it unique or important in the field? I'd appreciate any insights you can provide.