This document provides an overview of statistical mechanics. It defines microstates and macrostates, and explains that statistical mechanics studies systems with many microstates corresponding to a given macrostate. The Boltzmann distribution is derived, which gives the probability of finding a system in a particular microstate as being proportional to the exponential of the negative of the energy of that microstate divided by the temperature. Maxwell-Boltzmann statistics are described as applying to classical distinguishable particles, yielding the Maxwell-Boltzmann distribution. References for further reading are also included.
This presentation shows a technique of how to solve for the approximate ground state energy using Schrodinger Equation in which the solution for wave function is not on hand
CHAPTER 6 Quantum Mechanics II
6.0 Partial differentials
6.1 The Schrödinger Wave Equation
6.2 Expectation Values
6.3 Infinite Square-Well Potential
6.4 Finite Square-Well Potential
6.5 Three-Dimensional Infinite-Potential Well
6.6 Simple Harmonic Oscillator
6.7 Barriers and Tunneling in some books an extra chapter due to its technical importance
Time Independent Perturbation Theory, 1st order correction, 2nd order correctionJames Salveo Olarve
The presentation is about how to solve the new energy levels and wave functions when the simple Hamiltonian is added by another term due to external effect (can be due to external field) .
The intended reader of this presentation were physics students. The author already assumed that the reader knows dirac braket notation.
origin of quantum physics -
Inadequacy of classical mechanics and birth of QUANTUM PHYSICS
ref: Quantum mechanics: concepts and applications, N. Zettili
This presentation shows a technique of how to solve for the approximate ground state energy using Schrodinger Equation in which the solution for wave function is not on hand
CHAPTER 6 Quantum Mechanics II
6.0 Partial differentials
6.1 The Schrödinger Wave Equation
6.2 Expectation Values
6.3 Infinite Square-Well Potential
6.4 Finite Square-Well Potential
6.5 Three-Dimensional Infinite-Potential Well
6.6 Simple Harmonic Oscillator
6.7 Barriers and Tunneling in some books an extra chapter due to its technical importance
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The presentation is about how to solve the new energy levels and wave functions when the simple Hamiltonian is added by another term due to external effect (can be due to external field) .
The intended reader of this presentation were physics students. The author already assumed that the reader knows dirac braket notation.
origin of quantum physics -
Inadequacy of classical mechanics and birth of QUANTUM PHYSICS
ref: Quantum mechanics: concepts and applications, N. Zettili
Space lattice, Unit cell, Bravais lattices (3-D), Miller indices, Lattice planes, Hexagonal closed packing (hcp) structure, Characteristics of an hcp cell, Imperfections in crystal: Point defects (Concentration of Frenkel and Schottky defects).
X – ray diffraction : Bragg’s law and Bragg’s spectrometer, Powder method, Rotating crystal method.
Different physical situation encountered in nature are described by three types of statistics-Maxwell-Boltzmann Statistics, Bose-Einstein Statistics and Fermi-Dirac Statistics
Fi ck law
Diffusion: random walk of an ensemble of particles from region of high “concentration” to region of small “concentration”.
Flow is proportional to the negative gradient of the “concentration”.
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statistic mechanics
1. WELCOME TO YOU ALL
PHYSICAL
CHEMISTRY
PRESENTATION
M.SC.-II –
(SEM. III )
2013–
STATISTICAL 2014
MECHANICS
PAPER-III
Presented by :–
Dharmendra R. Prajapati
RAMNIRANJAN JHUNJHUNWALA
COLLEGE
2.
3. Why do we study Statistical Mechanics?
Why do we study Statistical Mechanics?
4. DEFINITIONS:Microstate:A Microstate is defined as a state of the system where all the
parameters of the con-stituents (particles) are specified.
Many microstates exist for each state of the system specified in
macroscopic variables (E, V, N, ...) and there are many parameters for
each state. We have 2 perspectives to approach in looking at a
microstate :
Classical Mechanics:The position (x,y,z) and momentum (Px, Py, Pz) will give 6N degrees
of freedom and this is put in a phase space representation.
Quantum Mechanics:The energy levels and the state of particles in terms of quantum
numbers are used to specify the parameters of a microstate.
5. MACROSTATE
A Macrostate is defined as a state of the system where the distribution
of particles over the energy levels is specified..
The macrostate includes what are the different energy levels and the
number of particles having particular energies. It contains many
microstates.
In the equilibrium thermodynamic state, we only need to specify 3
macroscopic variables (P,V,T) or (P,V,N) or (E,V,N),
where P : pressure, V : Volume, T : Temperature,
N : Number of particles and E : Energy. The equation of state for the
system relates the 3 variables to a fourth, for e.g. for an ideal gas.
PV = nRT
We also have examples of other systems like magnetic systems (where
we include M, the magnetization). However, the equilibrium macrostate
is unknown from thermodynamics.
6. The total number of microstates is:
Ω = ∑w
wn
True probability P (n) =
Ω
For a very large number of particles
Ω ≅ wmax
7. “Probability theory is nothing but common sense reduced to calculations”
- Laplace (1819)
An event (very loosely defined) – any possible outcome of some
measurement.
An event is a statistical (random) quantity if the probability of its
occurrence, P, in the process of measurement is < 1.
The “sum” of two events: in the process of measurement, we observe
either one of the events.
Addition rule for independent events:
P (i or j) = P (i) + P (j)
(independent events – one event does not change the probability for the
occurrence of the other).
The “product” of two events: in the process of measurement, we observe both
events.
Multiplication rule for independent events:
P (i and j) = P (i) x P (j)
9. Boltzmann Statistical Distribution
–
1877,L. Boltzmann
– derived the distribution function when studying the
collisions of gas molecules owing to which the
distribution set in.
– In the thermodynamic system which is made up with
classical particles, if these particles have the same
mechanical properties, and they are independent, the
system’s most probable distribution is called
Boltzmann’s statistical Distribution.
10.
11. The Boltzmann Distribution
The Austrian physicist
Boltzmann asked the following
question: in an assembly of
atoms, what is the probability
that an atom has total energy
between E and E+dE?
His answer:
where
Pr( E ) µ f B ( E )
f B ( E ) = Ae − E / kT
12. The Boltzmann Distribution
f B ( E ) = Ae − E / kT
is called the
Boltzmann distribution,
e-E/kT is the Boltzmann
factor and
k = 8.617 x 10-5 eV/K
is the Boltzmann constant
The Boltzmann distribution
applies to identical, but
distinguishable particles
13. The Boltzmann Distribution
The number of particles with energy E is given
by
n( E ) = g ( E ) f B ( E ) = Ag ( E )e − E / kT
where g(E) is the statistical weight, i.e., the
number of states with energy E.
However, in classical physics the energy is
continuous so we must replace g(E) by g(E)dE,
which is the number of states with energy
between E and E + dE. g(E) is then referred to
as the density of states.
14. Maxwell-Boltzmann Statistics
Maxwell-Boltzmann Statistics
We take another step back in time from quantum mechanics (1930’s)
to statistical mechanics (late 1800’s).
Classical particles which are identical but far enough apart to be
distinguishable obey Maxwell-Boltzmann statistics.
classical ⇔ “slow,” wave functions don’t overlap
distinguishable ⇔ you would know if two particles
changed places (you could put your finger on one and
follow it as it moves about)
Two particles can be considered distinguishable if their separation is
large compared to their de Broglie wavelength.
Example: ideal gas molecules.
15. Maxwell-Boltzmann distribution function is
fε )= A e -ε/kT
(
The number of particles having energy ε at temperature T is
nε
(
)=
A g ε )e
(
.
-ε/ kT
A is like a normalization constant; we integrate n(ε) over all
energies to get N, the total number of particles. A is fixed to
give the "right" answer for the number of particles. For some
calculations, we may not care exactly what the value of A is.
ε is the particle energy, k is Boltzmann's constant
(k = 1.38x10-23 J/K), and T is the temperature in Kelvin.
Often k is written kB.
When k and T appear together, you can be sure that k is
Boltzmann's constant.
16. nε ) = A g ε )e
(
(
-ε/ kT
We still need g(ε), the number of states having energy ε.
We will find that g(ε) depends on the problem under
study.
17. Summary
• Statistical physics is the study of the collective
behavior of large assemblies of particles
• Ludwig Boltzmann derived the following
energy distribution for identical, but
− E / kT
distinguishable, particles
f B ( E ) = Ae
• The Maxwell distribution of molecular speeds
is a famous application of Boltzmann’s general
formula