The Paschen Series refers to a set of spectral lines in the infrared region of the electromagnetic spectrum. These lines are produced when an electron in a hydrogen atom transitions from a higher energy level to the third energy level. The series is named after the German physicist Friedrich Paschen, who first described these transitions in the early 20th century. In the Paschen Series, the wavelengths of the emitted light can be calculated using the Rydberg formula. This series is significant in understanding atomic structure and the behavior of hydrogen, which is the simplest atom. The Paschen Series is part of a broader classification of spectral lines, including the Balmer Series and the Lyman Series.