University:
North Idaho College
Course:
PHYS-211 | Engineering Physics I
Academic year:

2023
Views:

298

Pages:

4
Author:

Hani T.

Atomic Spectra Since discrete energy levels are essential, it is imperative that their signatures be present in the spectroscopic data. The radiation emitted by hydrogen gas, for example, exhibits sharp lines with distinct spacing between them. Such distinct lines have been experimentally observed at various regions of the electromagnetic spectrum. These observations are of profound importance in view of their significant in the atomic structure and Quantisation of energies The presence of these lines was of Variance with the concepts of Classical physics. These lines are caused dur to transitions occuring Between various energy states, if two enelgy levels ore denoted by the numbers n and m, the radiation emitted during The t'ansition om n (initial State) to m (Siral State) En = -RH/n² Em = -RH/m² Em - En = hν = RH[(1/n²) - (1/m²)] RH denotes the Rydberg constant = 1.0967 x 10^7 m^-1 on the basis of the appearance in various frequency ranges, the spectra can be classified as follows: • Lyman series: (ultraviolet region) 10 nm to 350 nm n=1 m=2, 3, 4 Balmer Series: (visible region 350nm to 750nm) n = 2 m = 3,4,5 The original Balmer spectra exhibited 4 lines at 410nm, 434nm, 486 nm and 656 nm.