[Pw_forum] Raman intensities

[loc duong ding]

Dear all,

I get the result of cross section of Raman and IR. The results is: 

mode   [cm-1]     [THz]      IR           Raman     depol
    1    -49.14   -1.4731    0.0052     28548.6002    0.3331
    2     -1.11   -0.0334    0.0047        27.1463    0.3346
    3     -0.96   -0.0287    0.0000        96.7501    0.3334
    4     -0.15   -0.0044    0.0000       225.2733    0.3332
    5     40.15    1.2036    0.0000       121.0591    0.4037
    6    112.68    3.3779    0.0000       185.3034    0.3349
    7    128.41    3.8497    0.0000         4.7151    0.3694
    8    142.59    4.2746    0.0000     10709.2105    0.7499
    9    181.32    5.4357    0.0000    243179.7169    0.7500
   10    246.83    7.3996    0.0000       210.2380    0.3358
   11    248.15    7.4393    0.0000       946.7975    0.3334
   12    257.43    7.7176    0.0006    134557.9663    0.7305
   13    277.21    8.3106  181.7555        35.8045    0.5489
   14    296.65    8.8934    0.0123    212096.8703    0.7500
   15    316.99    9.5031    0.0000   3319515.9438    0.3347
   16    322.75    9.6759    0.0002 392852053.6176    0.3331
   17    346.79   10.3965    0.0000      9223.9833    0.3332
   18    399.65   11.9812    0.0007     57428.3543    0.3331
   19    433.43   12.9938  223.9962        31.6281    0.3367
   20    459.73   13.7823    0.0000       408.3847    0.3335
   21    493.49   14.7944    0.0008      7524.6853    0.3331
   22    494.82   14.8344    0.0000         4.6699    0.3366
   23    552.96   16.5773    0.0019      4612.5049    0.7498
   24    601.32   18.0269    0.0178       100.2209    0.3333
   25    657.09   19.6990    0.0005     13086.6164    0.7182
   26    691.87   20.7417    0.0221    147783.1907    0.7500
   27    712.36   21.3559  316.9795        20.0803    0.4981
   28    757.22   22.7009    0.0000         3.7927    0.3535
   29    810.51   24.2982    0.0002     49601.6103    0.6321
   30    829.99   24.8823    0.0001 378123798.5341    0.3331
   31    889.73   26.6732    0.0040    261989.5029    0.7500
   32    900.13   26.9851   72.6389       226.1128    0.3424
   33    960.43   28.7928    0.2552    163055.4564    0.3333
   34   1058.56   31.7346    1.4990      2339.9652    0.3335
   35   1094.46   32.8109    0.0003  43125138.6735    0.3333
   36   1176.60   35.2734    1.0137   3874332.1531    0.7500
   37   1204.18   36.1002    0.1132     71069.5276    0.3333
   38   1211.41   36.3170 6485.3035       217.2241    0.6163
   39   1264.93   37.9215   79.8659    277323.1409    0.3342
   40   1267.13   37.9874    0.00405894499335.7395    0.3333
   41   1304.63   39.1116    0.0243   6531558.0536    0.7500
   42   1315.15   39.4271    0.0000***************    0.3334
   43   1320.93   39.6002    0.0155     56014.3750    0.7489
   44   1340.74   40.1941  173.8033      2011.1932    0.4036
   45   1377.51   41.2964    0.0000***************    0.3333
   46   1425.62   42.7388    0.4155   2966610.7786    0.3333
   47   1444.87   43.3159  641.8946      1306.3132    0.6139
   48   1463.04   43.8606    0.3417   2346744.2359    0.7500
   49   1470.38   44.0805    0.0072   1649073.1055    0.3333
   50   1673.43   50.1678    0.00053292427777.4092    0.3332
   51   1710.56   51.2809    0.6754    361223.8840    0.3333
   52   1770.87   53.0891    0.0002***************    0.3333
   53   1902.37   57.0314    0.6005    525782.3731    0.3333
   54   2057.64   61.6862    0.0000***************    0.3333

The result of raman is strange with *******? Is it because the value of raman intensities too large? How can I solve this problem?

I wonder another thing is that the raman intensities is strongly dependent on laser direction. What is the meaning of cross section in this calculation?   

I appreciate to all your instructions. 

 
Sincerely,
-----------------------------------------------
Loc Duong Dinh
Ms-Ph.D Student
Sungkyunkwan Advanced Institute of Nanotechnology,
Sungkyunkwan University,
Suwon, 440-746, Korea 
Email: mambom1902 at yahoo.com, ddloc at skku.edu