Instrumental Analysis Exam 2 questions with verified
answers
Briefly describe second-harmonic generation. Ans✓✓✓ Light passing
through certain nonlinear crystals leads to the generation of a
nonlinear polarization wave at twice the frequency and so light at twice
the frequency can be produced
Describe excimer lasers. Ans✓✓✓ Contain mixture of He, F and noble
gas ; noble gas is excited and reacts with F to form excimers that decay
and give off radiation
Describe how light passes through a medium if no extraneous
processes occur. Ans✓✓✓ The oscillating EM fields lead to polarization
of the electron clouds which then relax and re-emit the radiation with
no permanent energy change
For what spectroscopy method are sample containers not needed?
Ans✓✓✓ Emission
How are effective bandwidth and transmission related? Ans✓✓✓ They
are directly proportional
How are interference filters constructed? Ans✓✓✓ Dielectric layer of
some thickness sandwiched between thin metal film and glass plates
, How can a narrow band of spectrum be isolated with absorption filters?
Ans✓✓✓ Using two cutoff filters
How can dye lasers be tuned? Ans✓✓✓ Changing the dye molecule?
How can the effects of stray radiation be mitigated? Ans✓✓✓ Using a
wavelength selector to filter out extraneous wavelengths
How do absorption filters work? Ans✓✓✓ They absorb some portion
of the spectrum, cutoff filters are a subset that have 100%T for some
region and 0%T otherwise
How do Barrier-Layer Photovoltaic Cells work? Ans✓✓✓ Radiation
strikes a semiconductor layer which frees an electron, the electron
moves through the wire to recombine with the hole and register a
current proportional to the number of photons that strike
How do holographic filters work? Ans✓✓✓ Modulating laser
wavelength and incident angle results in a grid pattern that can screen
out certain wavelengths
How do interference filters work? Ans✓✓✓ Beams that strike them are
bounced between the two metal layers in the dielectric and
interference results in only one set wavelength interfering
constructively and leaving the filter
answers
Briefly describe second-harmonic generation. Ans✓✓✓ Light passing
through certain nonlinear crystals leads to the generation of a
nonlinear polarization wave at twice the frequency and so light at twice
the frequency can be produced
Describe excimer lasers. Ans✓✓✓ Contain mixture of He, F and noble
gas ; noble gas is excited and reacts with F to form excimers that decay
and give off radiation
Describe how light passes through a medium if no extraneous
processes occur. Ans✓✓✓ The oscillating EM fields lead to polarization
of the electron clouds which then relax and re-emit the radiation with
no permanent energy change
For what spectroscopy method are sample containers not needed?
Ans✓✓✓ Emission
How are effective bandwidth and transmission related? Ans✓✓✓ They
are directly proportional
How are interference filters constructed? Ans✓✓✓ Dielectric layer of
some thickness sandwiched between thin metal film and glass plates
, How can a narrow band of spectrum be isolated with absorption filters?
Ans✓✓✓ Using two cutoff filters
How can dye lasers be tuned? Ans✓✓✓ Changing the dye molecule?
How can the effects of stray radiation be mitigated? Ans✓✓✓ Using a
wavelength selector to filter out extraneous wavelengths
How do absorption filters work? Ans✓✓✓ They absorb some portion
of the spectrum, cutoff filters are a subset that have 100%T for some
region and 0%T otherwise
How do Barrier-Layer Photovoltaic Cells work? Ans✓✓✓ Radiation
strikes a semiconductor layer which frees an electron, the electron
moves through the wire to recombine with the hole and register a
current proportional to the number of photons that strike
How do holographic filters work? Ans✓✓✓ Modulating laser
wavelength and incident angle results in a grid pattern that can screen
out certain wavelengths
How do interference filters work? Ans✓✓✓ Beams that strike them are
bounced between the two metal layers in the dielectric and
interference results in only one set wavelength interfering
constructively and leaving the filter
