Flame Emission Spectroscopy

What is flame emission spectroscopy?

An instrumental technique used to identify and measure metal ions from the wavelengths and intensities of light they emit.

What is the principle behind flame emission spectroscopy?

Excited electrons emit characteristic wavelengths of light when returning to lower energy levels.

What happens to electrons when metal ions are heated?

They can absorb energy and move to higher energy levels.

What happens when excited electrons return to lower energy levels?

They emit light of specific wavelengths.

Why does each metal ion produce a characteristic emission spectrum?

Different ions have different electron energy levels.

What does a flame emission spectrum show?

Emission intensity at different wavelengths.

How can flame emission spectroscopy identify metal ions?

By comparing characteristic spectral lines with reference spectra.

How can flame emission spectroscopy measure concentration?

The intensity of characteristic emission lines can be compared with calibrated standards.

Why is flame emission spectroscopy more useful than ordinary flame tests for mixtures?

It can distinguish different characteristic wavelengths, even when colours overlap.

What is an emission line?

A specific wavelength of light emitted by an excited atom or ion.

What does the position of a spectral line indicate?

The identity of the emitting element.

What does the intensity of a spectral line help indicate?

The concentration of the element, when calibrated.

Why is flame emission spectroscopy considered sensitive?

It can detect very small concentrations of some metal ions.

Why is it useful for analysing unknown solutions?

It can identify and measure metal ions in the sample.

What is a limitation of flame emission spectroscopy?

It requires specialised equipment and suitable calibration.

Why are reference standards important?

They allow reliable identification and concentration measurements.