fine structure, in spectroscopy, the splitting of the main spectral lines of an atom into two or more components, each representing a slightly different wavelength. Fine structure is produced when an atom emits light in making the transition from one energy state to another.

## What is fine-structure constant in physics?

In physics, the fine-structure constant, also known as Sommerfeld’s constant, commonly denoted by (the Greek letter alpha), is a fundamental physical constant which quantifies the strength of the electromagnetic interaction between elementary charged particles.

## What is fine structure of hydrogen atom?

When the familiar red spectral line of the hydrogen spectrum is examined at very high resolution, it is found to be a closely-spaced doublet. This splitting is called fine structure and was one of the first experimental evidences for electron spin. It is called the spin-orbit interaction. …

## How do you calculate fine structure?

atomic spectra a dimensionless constant called the fine-structure constant. This constant is given by the equation = ke2/hc, where k is Coulomb’s constant, e is the charge of the electron, h is Planck’s constant, and c is the speed of light.

## What is stark effect?

Answer: strack effect is shifting and splitting of spectral lines.of atoms and molecules . due to the presence of external electric field.it is electric field analogue of Zeeman effects.

## What is difference between fine-structure and hyperfine structure?

Fine structure describes the splitting of the spectral lines of atoms due to electron spin and relativistic corrections to the non-relativistic Schrdinger equation. … The hyperfine structure is caused by interaction between magnetic field (from electron movement) and nuclear spin.

## Why is 137 important?

But 137? The number 137, according to Lederman, shows up naked all over the place, meaning that scientists on any planet in the universe using whatever units they have for charge or speed, and whatever their version of Planck’s constant may be, will all come up with 137, because it is a pure number.

## What is a fine spectrum?

The fine spectrum is defined as the splitting of spectrum into closely spaced lines. This is observed when H atom is placed in Electrical or Magnetic field.

## What is fine structure constant give its value?

The fine-structure constant is of dimension 1 (i.e., it is simply a number) and very nearly equal to 1/137. It is the coupling constant or measure of the strength of the electromagnetic force that governs how electrically charged elementary particles (e.g., electron, muon) and light (photons) interact.

## What is Darwin term in fine structure?

The Darwin term changes the effective potential at the nucleus. It can be interpreted as a smearing out of the electrostatic interaction between the electron and nucleus due to zitterbewegung, or rapid quantum oscillations, of the electron.

## What is doublet line structure?

In quantum mechanics, a doublet is a composite quantum state of a system with an effective spin of 1/2, such that there are two allowed values of the spin component, 1/2 and +1/2. Quantum systems with two possible states are sometimes called two-level systems.

## Why is the hydrogen spectrum called line spectrum?

quantum theory atoms is known as a line spectrum, because the radiation (light) emitted consists of a series of sharp lines. The wavelengths of the lines are characteristic of the element and may form extremely complex patterns.

## What does 2p3 2 mean?

As an example, for 2p spectra, where n is 2 and l is 1, j will be 1/2 and 3/2, the area ratio for the two spin orbit peaks (2p1/2:2p3/2) will be 1:2 (corresponding to 2 electrons in the 2p1/2 level and 4 electrons in the 2p3/2 level).

## What causes the Lamb shift?

Interaction between vacuum energy fluctuations and the hydrogen electron in these different orbitals is the cause of the Lamb shift, as was shown subsequent to its discovery. … Lamb won the Nobel Prize in Physics in 1955 for his discoveries related to the Lamb shift.

## What is meant by LS coupling?

In atomic spectroscopy, RussellSaunders coupling, also known as LS coupling, specifies a coupling scheme of electronic spin- and orbital-angular momenta. … Russell-Saunders coupling is useful mainly for the lighter atoms, roughly for atoms with atomic number less than 57.

## What is Spectrum line?

A spectral line is like a fingerprint that can be used to identify the atoms, elements or molecules present in a star, galaxy or cloud of interstellar gas. If we separate the incoming light from a celestial source using a prism, we will often see a spectrum of colours crossed with discrete lines.

## Is called STAR effect?

The Stark effect is the shifting and splitting of spectral lines of atoms and molecules due to the presence of an external electric field. It is the electric-field analogue of the Zeeman effect, where a spectral line is split into several components due to the presence of the magnetic field.

## What are the uses of line spectra?

Spectral lines are often used to identify atoms and molecules. These fingerprints can be compared to the previously collected fingerprints of atoms and molecules, and are thus used to identify the atomic and molecular components of stars and planets, which would otherwise be impossible.

## What is the cause of hyperfine structure in ESR?

The hyperfine splitting (hfs) is a special feature of ESR caused by the interaction of electron spins with the magnetic nuclei in the sample. … When a number of magnetic nuclei coexist in a radical and interact with the unpaired electron, the ESR spectrum will contain many lines.

## What is spin of nucleus?

It is common practice to represent the total angular momentum of a nucleus by the symbol I and to call it nuclear spin. The nuclear spins for individual protons and neutrons parallels the treatment of electron spin, with spin 1/2 and an associated magnetic moment. …

## What is the meaning of hyperfine levels?

In atomic physics, hyperfine structure is defined by small shifts in otherwise degenerate energy levels and the resulting splittings in those energy levels of atoms, molecules, and ions, due to interaction between the nucleus and electron clouds.

## Why is three a magic number?

Throughout human history, the number 3 has always had a unique significance, but why? The ancient Greek philosopher, Pythagoras, postulated that the meaning behind numbers was deeply significant. In their eyes the number 3 was considered as the perfect number, the number of harmony, wisdom and understanding.

## What is the most important number in the universe?

number Pi One of the most important numbers in our universe is the number Pi or . Explore humankind’s odysseyattempts throughout the ages that truly transcend culturesto compute, approximate, and understand this enigmatic number.

## What is the magic number of the universe?

The number 42 is, in The Hitchhiker’s Guide to the Galaxy by Douglas Adams, the Answer to the Ultimate Question of Life, the Universe, and Everything, calculated by an enormous supercomputer named Deep Thought over a period of 7.5 million years. Unfortunately, no one knows what the question is.

## What does fine structure mean in biology?

: microscopic structure of a biological entity or one of its parts especially as studied in preparations for the electron microscope.

## What is alkali spectra and fine structure?

= Distance of the lone electron from the centre of the atomic core, i.e., nucleus. The coupling of spin with orbital angular momentum gives rise to the fine structure splitting of spectral lines and it gives a full account of the doublet structure of alkali spectra. This interaction is called spin orbit interaction.

## What is rotational fine structure?

The appearance of rotational fine structure is determined by the symmetry of the molecular rotors which are classified, in the same way as for pure rotational spectroscopy, into linear molecules, spherical-, symmetric- and asymmetric- rotor classes.

## What is the use of fine structure constant?

The fine-structure constant determines the strength of the electromagnetic force, and is central in explaining a number of phenomena including the interactions between light and charged elementary particles such as electrons.

## How is the fine structure constant measured?

She gauges the fine-structure constant by measuring how strongly rubidium atoms recoil when they absorb a photon. (Mller does the same with cesium atoms.)

## What is alpha fine-structure?

The fine structure constant, , can be thought of as the ratio between the energy needed to overcome the electrostatic repulsion driving these electrons apart and the energy of a single photon whose wavelength is 2 multiplied by the separation between those electrons.