問題一覧
1
usually refers to methods in which the stimulus is heat or electrical energy
emission spectroscopy
2
a form of energy that is transmitted through space at enormous velocities
electromagnetic radiation
3
the light we can see, ranging from violet to red
visible light
4
we measure the amount of light absorbed as a function of wavelength
absorption spectroscopy
5
is another way to describe electromagnetic radiation. It is most often used to describe radiation in the infrared region
wave number
6
is a vector quantity that provides a measure of the electric or magnetic field strength at a maximum in the wave
amplitude
7
stray radiation is commonly called ____
stray light
8
electromagnetic radiation can be treated as discrete packets of energy or particles called _____
photons or quanta
9
The energy associated with electromagnetic radiation covers a wide range of magnitude as do the corresponding frequencies and wavelengths
electromagnetic spectrum
10
it lies between visible light and x-rays and also used in UV visible spectroscopy to study organic transitions in molecules
ultraviolet
11
what are the most important forms of photoluminescence for analytical purposes
fluorescence and phosphorescence
12
unit of frequency
hertz
13
the distance between identical points
wavelength
14
refers to excitation of the analyte by a chemical reaction
chemiluminescence spectroscopy
15
literally multicolored light, is light of many wavelengths
polychromatic light
16
highest energy, highest frequency, shortest wavelength
gamma rays
17
Lowest energy, lowest frequency, longest wavelength.
radio waves
18
Lower energy, longer wavelengths.
microwaves
19
This states that the concentration of a substance if directly proportional to the amount of light absorbed or inversely proportional to the logarithm of transmitted light
beers law
20
the number of oscillations that occur in one second
frequency
21
is the time in seconds for successive maxima or minima to pass a point in space.
period
22
a particle of epectromagnetic radiation HAVING ZERO MASS and ENERGY of hv
photon
23
are spectroscopic methods based on ultraviolet, visible, and infrared radiation
optical methods
24
used to study atomic structures and medical imaging
x rays
25
electromagnetic radiation can be described as ____ with properties of wavelength, frequency, velocity and amplitude
wave
26
Used in IR spectroscopy to study molecular vibrations and identify functional groups in organic molecules
infrared
27
the visible region of the spectrum from about 400nm to almost 800nm
visible region
28
the emission of photons is measured
photoluminescence spectroscopy
29
used in analytical chemistry, and provide a wide range of quantitative and qualitative information
spectrometric technique
30
the visible region of spectrum
400nm to 800nm
31
defined as radiation from the instrument that is outside the nominal wavelength band chosen for the determination
stray light
32
transmitted via electromagnetic waves that are characterized by their frequency and wavelength
energy
33
tells us quantitatively how the amount of attenuation depends on the concentration of the absorbing molecules and the path length over which absorption occurs
beers law
34
The velocity of the wave front through a medium depends on both the medium and the frequency
velocity