Surface Characterization by Spectroscopy and Microscopy

Vocabulary flashcards related to surface characterization techniques discussed in the lecture.

X-ray Photoelectron Spectroscopy (XPS)

A technique that analyzes the surface of a material by measuring the kinetic energy of electrons ejected by X-ray photons.

Auger Spectroscopy (AES)

A surface analysis technique that measures the emission of Auger electrons to identify elemental composition.

Secondary Ion Mass Spectrometry (SIMS)

A method where high-energy ions bombard a sample, leading to the ejection of neutral and charged particles for mass analysis.

Laser Microprobe Mass Spectrometry

A technique using laser ablation to vaporize samples, allowing analysis via mass spectrometry.

Scanning Electron Microscopy (SEM)

An imaging technique that uses a focused beam of electrons to scan the surface of a sample and produce images.

Electron Microprobe

An analytical technique that uses incident electrons to produce X-rays from a sample for compositional analysis.

Photoemission Cross-Section

A term that describes the probability of emission from a given core level of an atom in photoemission spectroscopy.

Chemical Shift

A variation in binding energy observed in X-ray photoelectron spectroscopy related to the chemical environment of the atoms.

Ultra-High Vacuum (UHV) Chamber

A chamber used to conduct experiments in XPS to prevent air from interfering with electron detection.

Mean Free Path

The average distance traveled by electrons in a material before colliding with other atoms.

Sputtering

A process where surface atoms are ejected from a material after bombardment by energetic particles.

Binding Energy (BE)

The energy required to remove an electron from an atom, crucial for identifying elemental composition.

Relative Sensitivity Factor (S)

A calibration factor that relates the intensity of the photoelectron signal to atomic concentration in quantitative analysis.

Depth Profiling

A technique used in surface analysis to reveal the composition of different layers within a sample.

Auger Emission

The process where an ionized atom ejects an Auger electron after being excited by an incident photon or electron.