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Calculated Frequencies for IBr (Iodine monobromide) 1Σ C∞v

19 07 18 15 43
InChI=1S/BrI/c1-2 INChIKey=CBEQRNSPHCCXSH-UHFFFAOYSA-N


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An R subscript indicates raman activity data is available.
For a comparison of experimental versus calculated see section IV.C.1 Compare vibrational frequencies
Vibrational frequency in cm-1 (unscaled)
Methods with predefined basis sets

Vibrational frequency in cm-1 (unscaled)
Methods with standard basis sets
3-21G 3-21G* 6-31G* 6-31+G** 6-311G*
hartree fock HF 257R 304R     290R
density functional LSDA 246 299     272
BLYP 223 263     237
B1B95 246 297     272
B3LYP 236 279     255
B3LYPultrafine 233 279     258
B3PW91 242 291     267
mPW1PW91 246 295     273
M06-2X 249 300     280
PBEPBE 235 281     254
PBEPBEultrafine 231 280     257
PBE1PBE 247 297     274
HSEh1PBE 244 294     270
wB97X-D   301      
B97D3 225     dnf  
3-21G 3-21G* 6-31G* 6-31+G** 6-311G*
Moller Plesset perturbation MP2 234 292 274   274
MP2=FULL 234 293     274
MP4 218 280     260
B2PLYP 235 285     263
Configuration interaction CID 224 292     281
CISD 221 291     280
3-21G 3-21G* 6-31G* 6-31+G** 6-311G*
Quadratic configuration interaction QCISD 215 282     264
QCISD(T) 212 277     256
Coupled Cluster CCD 218 284     266
CCSD 215 282     264
CCSD(T) 212 276     256
CCSD(T)=FULL 212 277     256
3-21G 3-21G* 6-31G* 6-31+G** 6-311G*

Vibrational frequency in cm-1 (unscaled)
Methods with effective core potentials (select basis sets)
CEP-31G CEP-31G* CEP-121G CEP-121G* LANL2DZ SDD cc-pVTZ-PP aug-cc-pVTZ-PP Def2TZVPP
hartree fock HF 261R   261R   249R 255R 295R   292R
ROHF             295   292
density functional LSDA 243   243   234 238 279   278
BLYP 221   221   213 217 247   246
B1B95 247   247   230 242 279   277
B3LYP 235   235   226 230 263   262
B3LYPultrafine 235   235   226 230 263   262
B3PW91 244   244   233 239 274   273
mPW1PW91 248   248   236 243 279   278
M06-2X 252   252   240 246 288   286
PBEPBE 234   234   224 229 263   262
PBEPBEultrafine 234   234   224 229 263   262
PBE1PBE 249   249   237 244 281   279
HSEh1PBE 246   246   235 241 277   276
TPSSh             271   269
wB97X-D             283   282
B97D3             251   250
Moller Plesset perturbation MP2 228   228   223 225 288   285
MP2=FULL 228   228   223 225 289   286
ROMP2             288   285
MP3             279   274
MP3=FULL             280   275
MP4 208   208   203 204 274   269
MP4=FULL             275   271
B2PLYP 233   233   225 228 273   270
B2PLYP=FULL             273   270
B2PLYP=FULLultrafine             273   270
Configuration interaction CID 213   213   206 208 291   292
CISD 210   210   203 204 290   292
Quadratic configuration interaction QCISD 205   205   198 200 278   274
QCISD(T) 203   203   196 197     266
QCISD(T)=FULL             272   268
Coupled Cluster CCD 209   209   202 204 280   277
CCSD 205   205   198 200 278   275
CCSD=FULL             280   276
CCSD(T) 203   203   196 197 271   266
CCSD(T)=FULL 203   203   196 197 272   268
For descriptions of the methods (AM1, HF, MP2, ...) and basis sets (3-21G, 3-21G*, 6-31G, ...) see the glossary in section I.C. Predefined means the basis set used is determined by the method.
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