Realism, Physical Meaningfulness, and Molecular Spectroscopy

2021 ◽  
pp. 159-180
Author(s):  
Teru Miyake ◽  
George E. Smith
Keyword(s):  
Quantum Mechanics ◽  
Brownian Motion ◽  
Molecular Spectroscopy ◽  
Scientific Research ◽  
Stable Theory ◽  
Molecular Parameters ◽  
Atoms And Molecules ◽  
Structure Of Molecules ◽  
Stable Measurement ◽  
Realism Debate

Although the realism debate has focused on the work of Jean Perrin on Brownian motion, this chapter claims that the best place to look for a resolution of this debate is the period after the late 1920s, when stable theory-mediated measurement of molecular parameters first became possible through the application of quantum mechanics to spectroscopy. The chapter first examines how stable measurement of the molecular parameters of diatomic molecules was achieved in spectroscopy and then gauges what evidence there is that this stable measurement is giving spectroscopists access to the real properties and structure of molecules. It argues that an evaluation of the latter question requires a distinction to be made between physically meaningful representations and those that are not, and a full answer requires the deployment of that distinction in the analysis of scientific research on atoms and molecules in the period after 1950.

scholarly journals SUPERSYMMETRY AND BROWNIAN MOTION ON SUPERMANIFOLDS

2003 ◽  
Vol 06 (supp01) ◽  
pp. 83-102 ◽  
Author(s):  
ALICE ROGERS
Keyword(s):  
Quantum Mechanics ◽  
Brownian Motion ◽  
Morse Theory ◽  
Index Theorem ◽  
Supersymmetric Quantum Mechanics ◽  
Supersymmetric Model ◽  
Itô Formula ◽  
Ito Formula ◽  
And Brownian Motion

An anticommuting analogue of Brownian motion, corresponding to fermionic quantum mechanics, is developed, and combined with classical Brownian motion to give a generalised Feynman-Kac-Itô formula for paths in geometric supermanifolds. This formula is applied to give a rigorous version of the proofs of the Atiyah-Singer index theorem based on supersymmetric quantum mechanics. After a discussion of the BFV approach to the quantization of theories with symmetry, it is shown how the quantization of the topological particle leads to the supersymmetric model introduced by Witten in his study of Morse theory.

scholarly journals Brownian Motion and Quantum Mechanics

2019 ◽  
Vol 19 (02) ◽  
pp. 2050017
Author(s):  
Roumen Tsekov
Keyword(s):  
Quantum Mechanics ◽  
Brownian Motion ◽  
Turbulent Velocity ◽  
Simultaneous Action ◽  
Quantum Brownian Motion ◽  
Velocity Fluctuations ◽  
Diffusive Behavior ◽  
Stochastic Sources ◽  
Quantum Noises

A theoretical parallel between the classical Brownian motion and quantum mechanics is explored via two stochastic sources. It is shown that, in contrast to the classical Langevin force, quantum mechanics is driven by turbulent velocity fluctuations with diffusive behavior. In the case of simultaneous action of the thermal and quantum noises, the quantum Brownian motion is described as well.

scholarly journals Ultra-Weak Cell Radiation as an Impulse to Activate Biological Signal Transmission Paths

2021 ◽  
Vol 4 (3) ◽  
Keyword(s):  
Quantum Mechanics ◽  
Charge Transfer ◽  
20Th Century ◽  
Signal Transmission ◽  
Molecular Structures ◽  
Atoms And Molecules ◽  
Biological Signal ◽  
Donor Acceptor ◽  
Molecular Signal ◽  
A Charge

Basic physical research at the beginning of the 20th century developed concepts of the energetic properties of atoms and molecules with quantum mechanics, which increasingly also included biological structures. Considerations of a “charge transfer” or also known as “donor-acceptor interactions” of the movement of electrons between molecular structures developed. This energetic process is the basis of the ultra-weak cell radiation, which is to be discussed as the basis for the activation of the molecular signal transmission.

The Reality of Atoms

2017 ◽  
Author(s):  
Frank S. Levin
Keyword(s):  
Nineteenth Century ◽  
Brownian Motion ◽  
Statistical Mechanics ◽  
Atomic Structure ◽  
Periodic Table ◽  
Albert Einstein ◽  
Ancient Greek ◽  
Structure Of Molecules ◽  
Greek Philosopher ◽  
Jean Perrin

Chapter 3 focuses on the concept of atoms, which dates back to the ancient Greek philosopher Leucippus, who claimed that everything consisted of them. This view began to be accepted among scientists when John Dalton championed it in the 1800s, although he was wrong in his atomic structure of molecules. That was corrected not long after by Jöns Berzelius. From then on the reality of atoms, and whether those of chemistry were the same as those of physics was a matter of debate. The theory of statistical mechanics, developed in the second half of the nineteenth century, helped establish their reality for most physicists, while many chemists were won over later, in part by the periodic table developed by the Russian Dimitri Mendeleev. Nearly every scientist was finally convinced by the explanation of Brownian motion by Albert Einstein and Marian Smoluchowski, whose formulas were verified by Jean Perrin in 1909.

What’s Wrong with This Picture?

2020 ◽  
pp. 1-18
Author(s):  
Jim Baggott
Keyword(s):  
Quantum Mechanics ◽  
Classical Mechanics ◽  
Second Law Of Thermodynamics ◽  
Second Law ◽  
Atoms And Molecules ◽  
Intuitive Appeal ◽  
Light Waves ◽  
Microscopic World ◽  
Physical Principles ◽  
Conceptual Difficulties

Despite its intuitive appeal, classical mechanics is just as fraught with conceptual difficulties and problems of interpretation as its quantum replacement. The problems just happen to be rather less obvious, and so more easily overlooked or ignored. Quantum mechanics was born not only from the failure wrought by trying to extend classical physical principles into the microscopic world of atoms and molecules, but also from the failure of some of its most familiar and cherished concepts. To set the scene and prepare for what follows, this Prologue highlights some of the worst offenders, including: space and time; force and energy; the troublesome concept of mass; light waves and the ether; and atoms and the second law of thermodynamics.

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