CO SCI 136 Lecture Notes - Lecture 18: Trace Evidence, Data Analysis, Azimuthal Quantum Number
Document Summary
Xrf different elements emit characteristic x-rays when excited by an x-ray or high energy electron source . Measuring the energy = identity of the element. Measuring the intensity = amount of said element. Principles inner shell is excited and is removed. left by the excited electron and during this process a photon is released. Analysis of trace evidence gun shot residue, soil. Detection of visible and latent fingerprints by micro-xrf imaging. Internal rearrangement an electron from a higher energy level drops down to fill the gap. Excitation - when x-rays above a certain threshold interact with the atoms an electron from an: the principal quantum number must change by at least 1, the orbital quantum number must change by 1. Environmental elements from the surroundings interfere and appear in the spectrum he. Escape peaks x-rays strike the sample and promote fluorescence but lose some of their energy.
