Spectroscopy or spectrography both the terms referred to the measurement of radiation intensity and function of wavelength which are used to describe spectroscopic experimental methods. spectrometers, spectrophotometers, spectrographs or spectral analyzers are some of the devices. observation of color can be related to spectroscopy Neon lighting is a direct application of atomic spectroscopy and spectral characteristics generate specific colors and hues.

These Spectroscopic studies included Max Planck's explanation of blackbody radiation, Albert Einstein's explanation of the photoelectric effect and Niels Bohr's explanation of atomic structure and spectra which are used in developing the quantum mechanics. Spectroscopy is used in physical and analytical chemistry because atoms and molecules have unique spectra which is used to detect, identify and quantify. Spectroscopy is also used in astronomy and remote sensing. Telescopes have spectrographs which are used in determining the chemical composition and physical properties of astronomical objects.

Types of spectroscopy

Absorption spectroscopy, Emission spectroscopy, Elastic scattering and reflection spectroscopy, Crystallography, Impedance spectroscopy, Raman and Compton scattering, Coherent or resonance spectroscopy, Nuclear magnetic resonance (NMR) spectroscopy, Fourier-transform spectroscopy, Spectrophotometry which are more frequently used inn chemical analysis and chemistry labs.

Other spectroscopy methods used in various fields includes:

Acoustic resonance spectroscopy

Auger electron spectroscopy is a method used to study surfaces of materials and used in electron microscopy.

Cavity ring-down spectroscopy

Circular Dichroism spectroscopy

Cold vapour atomic fluorescence spectroscopy

Correlation spectroscopy

Deep-level transient spectroscopy

Dielectric spectroscopy

Electron energy loss spectroscopy

Electron phenomenological spectroscopy

Electron paramagnetic resonance spectroscopy

Force spectroscopy

Hadron spectroscopy

Baryon spectroscopy and meson spectroscopy are types of hadron spectroscopy

Laser spectroscopy

Neutron spin echo spectroscopy

Photoacoustic spectroscopy

Photoemission spectroscopy

Photothermal spectroscopy

Pump-probe spectroscopy

Saturated spectroscopy

Scanning tunneling spectroscopy

Time-stretch spectroscopy

Thermal infrared spectroscopy

Transient grating spectroscopy

Ultraviolet photoelectron spectroscopy

Ultraviolet–visible spectroscopy

Vibrational circular dichroism spectroscopy

Video spectroscopy

X-ray photoelectron spectroscopy