UV/VIS Review

A tungsten source produces light in the _____ range

A deuterium source produces light in the _____ range

Is the intensity of the light produced by a light source the same for each wavelength region it covers?

The cathode of a PMT is coated with a _____ material which emits electrons when struck by a photon

What kind of electrons does UV light interact with?

MO

Which has higher energy: bonding or anti bonding molecular orbitals?

MO with single bonds 

MO with double bonds

An asterisk * is used to denote

N electrons

Which type of transition tends to have smaller epsilon values?

HOMO

LUMO

The most important transition is typically the one with the (highest/lowest) energy

What are the characteristics of molecules that can have an n to pi* transition?

A functional group that absorbs light and contributes to a molecule's color

A group which affects how a chromophore absorbs (give the name and an example of one)

The shift of absorption to a longer wavelength (red shift)

The shift of absorption to a shorter wavelength (blue shift)

When an auxochrome increases absorbance, this is called

When an auxochrome decreases absorbance, this is called

Choose your solvent carefully because it can affect:

Charge Transfer Complex is another name for

If you have two species that absorb at the same wavelength, what are two options for analysis?

A name for a double beam technique where you measure the difference in absorbance between two samples

The name for titrations using spectrophotometry to detect the endpoint

When the actual absorbance is less than that predicted by Beer's law, this is called

Random thermal motion of electrons in the detector is called

Johnson's noise is typically more of a problem with

Movement of electrons in detector between anode and cathode without any incoming stimulation

The term for noise that occurs when the light source fluctuates

Two options to improve signal-noise ratio