31 MAY 1979


5550C
5710
56 6,C 5670C 5G80c
5690C
5695C
570 OC 5720
5730C 5740 5750 5760 5770
5780 5790 5800 5810
5320
5830 5840
5850 5860C 5870
5880 5884 5890 5900 5910 5920 5930C
5940 5945 5950 5960 5970 5980 5990 5995
6000C 6010
6D20 6030 6040 6050


   SUBPOUTt.IN INTEND (Y, Y2# C1I, C22,C 129C21 ,CI 12)

SUBPOUTINE TO CALCULATE INTERBAND RELAXATION TIME PARAPETFRS FOR ACOUSTICAL PHONON SCATTERING* BUTH LONGITUDINAL AND TRANSVERSE VInRATIONS ARE CONSIDfERFD

   qEAL L211,LII1 L222.L122•L212

   E TA=O.2125 ETAM.=-ETA
   E TAS=ETA**2
   - TAM S=7 TAM 4't 2 G l=SRTfY2/Y1)
   02=G1 - :
   G3=GV**3e
   G4= GI **4.
   BP={ 1o G2)
   3PS=( 1 .G2)**2o BMtS= ( I*, -G2 ) f, , -2 o,

   P&= (.,,/( 8.G2)*)(,+G2- BM*A"(2,G1) )

   P3=(J./(4ot ,G2))*IBP¢ {15,ofG4-220*G2+15o)/(48" *G4)I ( I o'+-(BP S  :( 5a:',G 4- 14 a0 G2+5 SoJ/ ( I  .n *G4)  A //(2  *Gl  ))
   P4=-MS* ( I * -BP* A/ (2o*GI) /'( 4 a*G2)


   L21 I =1--ETAS-2 ,ETA* ( 1 -ETA) *PI
   & ETA*G2$ ( 2o*( I oIETA )  .P!-3 •@ETANP2 )
   L222-CC.+-TA)**2 .F3**ETAS/4

   L 122=1 .-ETAMS-2o*ETAM (l I.-TAM) fpI+
         I EAMG~e (,  I  +TA ) ~l3* ETAM#  P2)
   L2I2=-ETA (I .-iETA) *P2+G24cTA1( (I. +ETA) *P2
   &-3! TA4P3 )

   T111-0.75
   T222--0*75
   T122-9.*( .-P4) /4.
   T211=T 122
   T212=--9*,*P5/16.