λ (nm) E (eV) ( f ) Major contribution Assignment Region Bands Gas   434.66 2.852 0.001 H→L (92) n→π* Visible R-band (German, radikalartig) 314.21 3.946 0.002 H→L (89) n→π* Quartz UV 312.12 3.962 0.002 H→L (86) n→π* Quartz UV DMSO   271.82 4.561 0.003 H→L-1 (90) n→π* Quartz UV R-band (German, radikalartig) 230.01 5.390 0.009 H→L-1 (90) n→π* Quartz UV 228.07 5.436 0.002 H→L-1 (87) n→π* Quartz UV 204.60 6.059 0.063 H+1→L-1 (83) σ→σ* Quartz UV Methanol   272.39 4.551 0.0003 H→L-1 (86) n→π* Quartz UV R-band (German, radikalartig) 231.30 5.360 0.009 H→L-1 (85) n→π* Quartz UV 228.26 5.431 0.002 H→L-1 (78) n→π* Quartz UV 207.42 5.977 0.068 H+1→L-1(77) σ→σ* Quartz UV Ethanol   273.0 4.541 0.0003 H+1→L (86) n→π* Quartz UV R-band (German, radikalartig) 232.72 5.327 0.009 H+1→L-1 (85) n→π* Quartz UV 228.50 5.425 0.002 H→L-1 (78) n→π* Quartz UV 207.89 5.964 0.069 H+1→L-1(74) σ→σ* Quartz UV Acetone   273.54 4.532 0.0004 H+1→L (90) n→π* Quartz UV R-band (German, radikalartig) 234.01 5.298 0.009 H→L-1 (83) n→π* Quartz UV 228.71 5.421 0.002 H→L-1 (88) n→π* Quartz UV 208.22 5.954 0.067 H+1→L-1(86) σ→σ* Quartz UV H: HOMO; L: LUMO

Table 6: Theoretical electronic absorption spectra of L-Valine (absorption wavelength λ (nm), excitation energies E (eV) and oscillator strengths (f) using TD-DFT/B3LYP/6- 311++G(d,p) method.