Vibration of a diatomic simple cubic lattice with a hole

Vol.

1 No.

6

LATTICE

DIO.

VIBRATION

CONFERENCE

OF A DIATOMIC

ABSTRACTS

SIMPLE

CUBIC

S. T a k e n o (Department of Physics, University, Sapporo, Japan) An

investigation

properties actions

of

localized

a hole

each

component modes

forbidden problem hole

process

and

of

not

is

give

well

DIRECT

the

there

cubic

CALCULATION

an

two with and

waves

are

on

the

lattice

It

heavier

three

is

with.

In

It

and

the

Rayleigh

scattering.

OF M O D E S

MODIFIED

BY

vibrations

investigated

using

shells

round

the

modes)

forced

making

full

the

relevant

enough

to

treat

most

model.

for

The

of

a 60-shell the

in

is

diamond

alkali

results

relaxation

of

entropies

spherical

well

time

an

as

held

an

about

we

have

and

all

have

been

applied

the

breadth

of

of

Work

formation round now

completed

structure

Possible

calculations

of

a vacancy on of

the

indicated.

to

By calculate

make

modes

N

large

to

centre.

For

of

of a

an

4-

the

applications modes

are

determined

these

results

absorption

thermal

to

out-

are

optical to

in N

frequency

'spherical'

and

diamond

applying

some

applications are

the

localised

in

the

usefully

those low

of vibration

F-band,

the

that

be

can

to a d i s c u s s i o n

the

and

one

with

modes

in

scattering

solution.

lattice

considered the

can

computer

them,

interaction

one

Philosophy

(for

continuum

modified

and

shown

except

or

electronic

for

IMPERFECTION

atoms fixed

to d i a g o n a l i s e

their

model

crystal

that

to

scattering

imperfection

elastic

using

halide

Mossbauer-like mentioned.

all

either

to

and

modes

model.

a point

information

ll-shell

The

are

concerning

dependence

explaining

and

an

of a n

calculations lined.

as

by

which

according

sufficient

in

in

symmetry

problems

imperfection

temperature

of

matrices

get

vibrations shell

a model

imperfection

to m o v e

use

modified

shown mass,

the

is

the

A POINT

paid

lying

bands.

modes

interis

p-type

C.W. McCombie, J.A.D. Matthew a n d J. S l a t e r (Natural Department, University of A b e r d e e n , Scotland) Lattice

with

eigenfrequencies

dealt

vibrational

attention

with

optical

quasi-localized by

Hokkaido

waves.

atom

s-type,

acoustical

to

described

exist

a hole

Particular

lattice

of

A HOLE

Science,

simple

vibrations

lattice

rise

site

of

of

of

the

low-frequency

diatomic

191

WITH

effect

scattering at

localized

between

the

only.

the

situated

of

TITLES

LATTICE

Faculty

neighbours

of motion

gap

does

DII.

is

made

alternating nearest

modes

when

d-type

an

between

is

AND

to bands

conductivity