What is alpha line in Lyman series?
The Lyman-alpha line, typically denoted by Ly-α, is a spectral line of hydrogen (or, more generally, of any one-electron atom) in the Lyman series. It is emitted when the atomic electron transitions from an n = 2 orbital to the ground state (n = 1), where n is the principal quantum number.
What causes Lyman alpha emission?
The Lyman-alpha line in most LAEs is thought to be caused by recombination of interstellar hydrogen that is ionized by an ongoing burst of star-formation. Such Lyman alpha emission was first suggested as a signature of young galaxies by Bruce Partridge and P. J. E. Peebles in 1967.
How the second line of Lyman series is produced?
The first line in each series is the transition from the next lowest number in the series to the lowest (so in the Lyman series the first line would be from n=2 to n=1) and the second line would be from from the third lowest to the lowest (in Lyman it would be n=3 to n=1) etc etc.
What is the second line of Lyman series?
The second line of Lyman series of H-atom coincides with the sixt line of Paschen series of an ionic species ‘X’.
Why is Lyman-alpha important?
Lyman alpha systems are becoming a very useful source of information in physical cosmology. The Lyman series is the series of energies required to excite an electron in hydrogen from its lowest energy state to a higher energy state.
Can we see Lyman series?
The Lyman series is in the ultraviolet while the Balmer series is in the visible and the Paschen, Brackett, Pfund, and Humphreys series are in the infrared.
How is the second line in Lyman is produced?
What is first line of Lyman series?
Hence the wavelength of the first line in the Lyman series of the hydrogen spectrum is λ=121.6nm .
What is the rest wavelength of the Lyman-alpha absorption line?
1216 Å
The Lyman-alpha spectral line has a laboratory, or rest, wavelength of 1216 Å, which is in the ultraviolet portion of the electromagnetic spectrum. The Lyman-alpha absorption lines in the quasar spectra result from intergalactic gas through which the galaxy or quasar’s light has traveled.
Which has more energy Lyman or Balmer?
The longer the arrow, the more energy released, and the shorter the wavelength of the light emitted. The Balmer series releases light in the visible region of the electromagnetic spectrum. The Lyman series, with longer arrows, requires the higher energy of the UV region.
What is the value of Lyman series?
In physics and chemistry, the Lyman series is a hydrogen spectral series of transitions and resulting ultraviolet emission lines of the hydrogen atom as an electron goes from n ≥ 2 to n = 1 (where n is the principal quantum number), the lowest energy level of the electron.
Why is O2 used as a filter for Lyman α?
There is a minimum in the absorption at 121.6 nm, coincident with the Lyman α line of the hydrogen atom. This fortunate coincidence allows O 2 to be used in laboratory studies of atomic hydrogen reactions as a filter for Lyman α radiation.
What is the intensity of Lyman alpha radiation?
The Lyman-α radiation comes from a discharge lamp, and the detected OH fluorescence is observed at 308–316 nm with a photomultiplier running in photon counting mode. The intensity of the fluorescent light and, therefore, the signal detected is proportional to the water vapor mixing ratio under stratospheric conditions.
What is the energy level of Lyman α transition?
The Lyman-α transition corresponds to an electronic transition from the energy level E2 = −3.4 eV to E1 = −13.6 eV from (n = 2 to n = 1) (see Fig. 10.37 ). Figure 10.37. Energy level diagram of the hydrogen atom.
How does the Lyman-α hygrometer work?
The Lyman-α hygrometers rely on the fluorescent method, which uses water vapor photodissociation at λ = 121.6 nm (alpha hydrogen emission) followed by the measurement of the fluorescence of excited OH radical.