A group of physicists led by Rashid Valiev, associate professor at TSU's Faculty of Physics, has created a model for calculating the photophysical characteristics of molecules—one that is applicable for molecules of any nature, including rare-earth lanthanides. Due to the introduction of the anharmonicity effect, the model can predict the properties of molecules even before their synthesis, without carrying out experiments. An article about the new model was published in the journal Physical Chemistry Chemical Physics.