Open Access

Table A.2

Anharmonic frequencies (cm−1) for the singlyexcited vibrational levels of PGIM isomers.

Level Symmetry Z-PGIM E-PGIM
ν1 A′ 3322 3337
ν2 A′ 3275 3286
ν3 A′ 3028 2911
ν4 A′ 2113 2121
ν5 A′ 1592 1605
ν6 A′ 1395 1385
ν7 A′ 1224 1224
ν8 A′ 922 916
ν9 A′ 640 643
ν10 A′ 591 596
ν11 A′ 211 219
ν12 A′′ 1099 1074
ν13 A′′ 817 795
ν14 A′′ 646 651
ν15 A′′ 289 285

Notes. Harmonic force-field data corrected by cubic and quartic semi-diagonal force constants obtained by fc-MP2 calculations (see text for details).

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