1.15 atomic spectra Flashcards
in atomic spectroscopy, as the concentration of an element within a sample increases…
the intensity of light emitted or absorbed increases.
how is an emission spectrum produced?
by measuring the intensity of light emitted at different wavelengths
during emission spectroscopy, how are photons emitted?
as the electrons drop to lower energy levels
in emission spectroscopy, how are electrons excited?
using high temperatures
how is an absorption spectrum produced?
by measuring how the intensity of absorbed light varies with wavelength
in absorption spectroscopy, how is radiation absorbed?
as electrons are promoted to higher energy levels
in absorption spectroscopy, what is directed at the atomised sample?
electromagnetic radiation
how is a sample atomised in absorption spectroscopy?
using a flame/electricity
what does 1st ionisation energy correspond to?
the wavelength at which spectral lines (i.e. energy levels) converge
each element has its own characteristic spectra, meaning…
these can be used to justify and quantify an element
which two types of spectra can be produced?
emission and absorption spectra
what does the light energy emitted by an atom produce?
a spectrum that is made up of a series of lines at discrete energy levels
what happens when an atom emits a photon of light?
an excited electron moves from a higher energy level to a lower energy level
what happens to electrons when energy is transferred to atoms?
electrons within the atoms can be promoted to higher energy levels
