<p>The possibility of employing a method for determining the pure electronic transition (<i>E</i>₀₀) in molecular electronic spectra using the quantum fluctuation theorem (QFT) with perturbations decreasing the elementary transition intensity and acting as its screening is considered. For this, a screening coefficient, i.e., a coefficient for decreasing the spectral intensity because of screening to a value satisfying the QFT, is introduced into the main QFT relation for the electronic transition. Examples of molecular electronic spectra from the visible, UV, and x-ray regions are used to show that introduction of a screening coefficient brings the spectrum into conformity with QFT conditions and, consequently, with the conditions for determining the pure electronic transition using it. <i>E</i>₀₀ in the proposed model is shown to depend on the screening coefficient, with <i>E</i>₀₀ closest to the true value corresponding to the lowest screening coefficient.</p>