Table 1 SERS bands and corresponding band assignments of R6G obtained under this investigation as well as those obtained experimentally and theoretically.

From: Detection of surface enhanced Raman scattering active hotspot using near field scanning optical microscopy

Mode of vibration (cm−1)

Experimental

Hayazawa et al.49

Theoretical50

 

1746

 

1716

C–C stretching in xanthene ring

1647

1647

1652

hybrid mode (phenyl ring with COOC2H5

1622

 

1615

  

1596

 

C–C stretching in phenyl ring

1572

1570

1577

C–N stretching in NHC2H5

1458

 

1458

  

1532

 
 

1422

 

1419

  

1503

 

C–C stretching in xanthene ring

1329

1359

1351

  

1308

 
 

1238

1269

 

C–H in-plane bending in xanthene ring

1185

1185

1192

  

1120

 
 

1078

1084

1084

 

887

919

895

 

832

 

819

C–C op bend

748

766

771

 

649

 

631

  

608

 
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