Separation methods
This technique is used to separate ions in the vapor phase.
What is gas chromatography?
Microscopic technique that can be used to measure birefringence in fibers.
Polarized light microscopy (PLM)
Type of test that can tell if a substance is likely present or if it is certainly not present
What is a presumptive test?
Paired with SEM to give elemental information about a sample.
What is energy dispersive x-ray spectroscopy (EDX or EDS)
In mass spectrometry, ions are separated based on differences in this.
What is their mass-to-charge ratios?
Asking questions based of a expert witness' CV is an example of _______
voir dire
Early eluting peaks co-elute (have poor resolution) while the late eluting peaks are very broad (have poor peak shape).
What is the General Elution Problem?
This is the most frequently used colorimetric test for screening unknown substance. Distinguishes between opiates (turns purple) and amphetamines (turns orange/brown).
Marquis test
Measures the absorption of light due to chromophoric groups in a molecule
What is UV-Vis
This is the type of ionization in indicated by a large molecular ion in the spectra.
What is soft ionization?
This made judges the gatekeepers of scientific evidence or expert testimony.
What is Daubert v Merrell Dow Pharmaceuticals
What is capillary electrophoresis?
The measure of an objective's ability to gather light and resolve fine detail
Numerical aperture
Use of spiral or grid search pattern is an example of ____.
Systematic searching
Spectroscopic methods that uses a beam of electrons to remove the inner shell of electrons from the atom
X-ray spectroscopy
ICP-MS is used for analysis of these basic units of matter and GC or LC-MS is used for the analysis of these.
elements / molecules
This test of admissibility of scientific evidence relies on the scientific methods being generally accepted by the scientific community
What is the Frye Test?
In MS, this component disperses ions based on mass-to-charge ratio.
What is the mass analyzer?
What is the source in an SEM? (i.e., replaces light in traditional optical microscopy)
Electron beam
The tool used to cut very thin slices for microscopic examination.
Microtome
Absorbance of this type of radiation causes rotation or vibration of the analyte molecule.
Chromatogram representing only a chosen single ion.
What is the selected ion chromatogram?
This test of admissibility of scientific evidence relies on a number of factors, including error rates, peer-review publication, and acceptance in the scientific community.
What is Daubert?
Pyrolsis-GC
Two compound microscopes side-by-side, so that both are directed at the same area of the specimen from different angles.
What is a stereoscopic microscope?
This multi-step colorimetric test forms a blue precipitate in the presence of cocine
Scott's test (cobalt thiocyanate)
Spectroscopic data is a result of the scattering of radiation any a molecule.
What is Raman
Two mechanisms of sample introduction for ICP-MS
Liquid injection (dissolve sample into liquid / acid digestion); laser ablation
What is the Rules of Evidence