FIU CHM 4130 - Key_for Chapter_6 (3 pages)

Previewing page 1 of 3 page document View the full content.
View Full Document

Key_for Chapter_6



Previewing page 1 of actual document.

View the full content.
View Full Document

Unformatted text preview:

CHAPTER 6 Key 6 1 a Coherent radiation is radiation that is made up of wave trains having identical frequencies or sets of frequencies and phase relationships that are constant with time b Dispersion in a transparent medium is its variation in refractive index as a function of wavelength c Anomalous dispersion is the sharp change in refractive index of a substance in a wavelength region where absorption is occurring d The work function of a substance is a constant that measures the energy required to remove an electron from the surface of the substance e The photoelectric effect involves the emission of electrons from the surface of a substance brought about by a beam of radiation f The ground state of a molecule is its lowest energy state g Electronic excitation is the process by which electrons in a substance are promoted from their ground state to higher electronic states by absorption of energy h Blackbody radiation is the continuum radiation emitted by a solid when it is heated i Fluorescence is a type of emission which is brought about by irradiating atoms ions or molecules with electromagnetic radiation Fluorescence involves a singlet tosinglet transition The lifetime of the excited state in fluorescence is very short 10 5 s or less j Phosphorescence is a type of emission brought about by irradiating a molecular system with electromagnetic radiation Phosphorescence involves a triplet to singlet transition and the excited state lifetime is longer than that of a fluorescing species k Resonance fluorescence is a type of emission in which the radiation produced is of the same wavelength as that used to excite the fluorescence l A photon is a bundle or particle of radiant energy with a magnitude of h where h is Planck s constant and is the frequency of the radiation m Absorptivity a is defined by the equation a A bc where A is the absorbance of a medium contained in a cell length of b and concentration c The path length b is expressed in cm or another specific



View Full Document

Access the best Study Guides, Lecture Notes and Practice Exams

Loading Unlocking...
Login

Join to view Key_for Chapter_6 and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Key_for Chapter_6 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?