As a consequence, the spectrum of the emitted radiation no longer consists of practically one single, sharp spectral line at 254 nanometres, but the radiation energy is distributed over various broadened spectral lines corresponding to different electronic energy levels of the mercury atom, the strongest emissions lying at 303, 313, 334, 366, 405, 436, 546, and 578 nanometres.
This significant band-gap reduction is associated with charge-transfer, corresponding to the electronic excitation from the valence band (VB) to the conduction band (CB).
This absorption shoulder can be understood as a combination of surface plasmon resonance form Cu nanoparticles and absorption corresponding to intraband electronic transitions [18].
From the absorption spectrum in the UV-Vis region (Fig. 3), the 4HR aqueous solution showed the characteristic absorption at ~270 nm, corresponding to π π* electronic transition (Silverstein et al. 1991).
In another hand, the HOMO possesses an anti-bonding character between the consecutive subunits, while the LUMO of all oligomers shows a bonding character between the two adjacent fragments, so the lowest lying singlet states are corresponding to the electronic transition of π π* type.
The system consists of a waveform generator which sends electronic signal of arbitrary functions out and a pneumatic controller which sends the air pressure waveform out corresponding to the input electronic signal through a feedback system.
As part of a detailed analysis of the experimental spectroscopic networks corresponding to the ground electronic states of the 32S16O2, 33S16O2, and 34S16O2 isotopologues, the MARVEL (Measured Active Rotational Vibrational Energy Levels) procedure is used to determine the rovibrational energy levels.
Note that in the powder, EPR spectrum of the Mn2+ dominates (has the highest intensity) of a set of six hyperfine lines corresponding to the central electronic transition +1/2↔−1/2.
Figure 5a shows the characteristic exciton absorption peaks at 550, 540, 560 nm for the TGA-CdSe, DHLA-CdSe and MUA-CdSe QDs, respectively, which are corresponding to their first electronic transition.
Analogous expressions hold for the free energy surface corresponding to the final electronic state.
