Elements of Raman Spectroscopy Introduction to Photoluminescence
Spectroscopy
U1000
U1000
Slits
Reflection Grating
Transmission Grating
Grating Equation
Grating Equation
)sin(sincos
sinsin
)sin(sin
Gm
Gm
dm
Grating Equation
Littrow Configuration
orderzeroorreflectionspecular
formirrorm
dm
)(0
)sin/arcsin()(
sin2dm
Grating Equation Deviation angle
Scan angle
Grating equation for mounts
K2
2
sincos2 Kdm
Sin-Drive; Cosecant-Drive
L
xKdm
L
xcos2sin
Diffraction Order
Order Overlap
Dispersion Angular
Dispersion
Linear Dispersion
secsec
cosGm
d
m
d
m
d
dD
sec''' Gmrd
drDr
Dispersion Reciprocal Linear Dispersion (nm/mm)
2.43 nm/mm for U1000 w/ 1800 g/mm grating
'
cos
mr
dP
Resolving Power
/2
2sinsin
/)sin(sin
/)sin(sin
WR
WR
NdR
mNR
MAX
Focal Length and F/#
F/# Matching
Over match: Loss of signal Under match: Loss of resolving
power Choose collection optics geometry
to match it to the F# of the monochromator
PMT
PMT
Spectral Responsivity
PMT
Transfer Function/Throughput
Polarization dependent Wavelength dependent Ideal light source? No! Use a black body at a known temp Use calibrated W lamp With known incident spectral light
density measure output and calculate T. Important for PL exp not so for Raman.