Band spectrum and line spectrum

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SUMMARY

Atoms in an excited state emit line spectra due to their discrete energy levels, which only allow for specific wavelengths of light. In contrast, molecules can emit band spectra because they possess a greater number of energy levels when bound in a liquid or solid state. This results in a broader range of emitted light. Therefore, the state of matter significantly influences the type of spectrum produced, with isolated atoms emitting line spectra and molecules emitting band spectra.

PREREQUISITES
  • Understanding of atomic energy levels
  • Knowledge of molecular bonding and energy states
  • Familiarity with the concept of light emission and spectra
  • Basic principles of quantum mechanics
NEXT STEPS
  • Research the differences between line spectra and band spectra
  • Explore the principles of atomic and molecular spectroscopy
  • Study the effects of temperature and pressure on spectral emissions
  • Learn about quantum mechanics related to energy level transitions
USEFUL FOR

Students of chemistry, physicists, and anyone interested in the principles of spectroscopy and the behavior of atoms and molecules in different states of matter.

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why do the atoms in excited state alone could emit line spectra?can't they emit when they are not in gaseous state?

why only molecules can emit band spectra?can't atoms emit them
 
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An isolated atom, such as one in a gaseous state, has only its atomic energy levels available to accept or give up energy. Since these energy levels are discrete, the light emitted by the atoms will also be in discrete wavelengths.

Atoms bound in molecules or in a liquid state have more energy levels to accept or give up energy from. As such, the light they emit will be over a much broader range. In an everyday solid or liquid the amount of energy levels is so large that light is emitted over the entire spectrum.
 

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