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PAC, 2007, 79, 293. Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006), doi:10.1351/pac200779030293

α-cleavage (alpha-cleavage)
α-elimination
absorbed (spectral) photon flux density
absorbed (spectral) radiant power density
actinic
actinism
acyl shift (1,2-, 1,3-, photochemical)
alkene photocycloaddition
alkene photodimerization
alkene photoisomerization
alkene photorearrangement
AM 0 sunlight
AM 1 sunlight
amalgam lamp
aromatic photocycloaddition
asymmetric photochemistry
aza-di-π-methane rearrangement
bicycle rearrangement
bicycle-pedal (BP) mechanism
biphotonic excitation
biphotonic process
bipolarons
branching plane
Brewster angle, $θ B$
brightness
brightness of a laser dye
chemically induced dynamic electron polarization (CIDEP)
chemically initiated electron exchange luminescence (CIEEL)
color scale
colourability
complete active space self-consistent field (CASSCF)
complete active space self-consistent field second-order perturbation theory (CASPT2)
computational photochemistry
concentration depolarization
conical intersection
continuous wave (CW) laser
conversion cross-section
crystal photochemistry
cut-on filter
DAS
Dauben–Salem–Turro rules
de Mayo reaction
di-π-methane rearrangement
di-π-silane rearrangement
dichroic filter
dichroic mirror
dichroism
diradicaloid
dose
downconversion
driving force (for electron transfer)
Drude–Nernst equation (for electrostriction)
dual fluorescence of systems or molecular species
dual-mode photochromism
E/Z photoisomerization
El-Sayed rules
electron back-transfer
electrostriction
emission anisotropy
entrainment in photochemistry
excimer lamp
exposure in photochemistry
fatigue of a photochromic system
fluence rate, $E o$
fluorescence lifetime
fluorescence resonance energy transfer
fluorogenic
fluorophore
Förster-resonance-energy transfer FRET
Fourier-transform spectroscopy
frequency, $ν$ , $ω$ in photochemistry
frequency-domain fluorometry
FRET
gated photochromism
geminate ion pair
Gibbs energy of photoinduced electron transfer
global analysis
half-life, $τ 1/2$ , of a transient entity
half-life, $T 1/2$ , of a photochromic system
heliochromism
hula-twist (HT) mechanism
hyperfine (interaction)
IC
ICT
ICT emission
infrared
intersection space
intramolecular charge transfer, (ICT)
irradiance (at a point of a surface), $E$
ISC
isolampsic point
isooptoacoustic point
isosbestic point
isostilbic point
Jahn–Teller effect
Kasha rule
LADS
Landau–Zener model
LAS
laser dye
laser-jet photochemical technique
LED
lifetime, $τ$
light polarization
light-emitting diode (LED)
linear dichroism (LD)
magic angle
magnetic circular dichroism
Marcus equation (for electron transfer)
medium-pressure mercury lamp
mercury–xenon lamp
minimum-energy reaction path
molar absorption coefficient, $ɛ$
molecular orientation
monochromator
multiconfiguration SCF method
multireference configuration interaction
non-crossing rule
non-linear optical techniques
non-vertical energy transfer
normal region (for electron transfer)
Norrish Type I photoreaction
Norrish Type II photoreaction
Norrish–Yang reaction
nucleophilic aromatic photosubstitution
OLED
one-bond-flip
one-photon photochromism
optical multi-channel analyser
optical parametric amplification
optical parametric oscillator
optoacoustic spectroscopy
orbital (atomic or molecular)
parametric amplification
parametric processes
Peierls distortion
phonon
phosphorescence lifetime
photo-Bergman cyclization
photo-Claisen rearrangement
photoaffinity labelling
photobiology
photocatalysis
photocatalyst
photochemical funnel
photochemical nitrogen extrusion
photochemical reaction
photochemical reaction path
photochemical smog
photochromism
photocyclization
photocycloaddition
photodecarbonylation
photodecarboxylation
photodeconjugation
photohydration
photoisomerization
photoluminescence
photon counting
photon echo
photon exitance, $M p$
photon exposure, $H p$
photon fluence, $H p , o$ , $F p , o$
photon fluence rate, $E p , o$
photon flux, $q p$ , $Φ p$
photon irradiance, $E p$
photon number, $N p$
photon radiance, $L p$
photorearrangement
photoselection
planar intramolecular charge transfer
PLED
polarization, $P$
polaron
pump-dump-probe technique
pump-probe technique
quantum mechanics/molecular mechanics
quantum yield, $Φ$
quartz–iodine lamp
quenching
radiance, $L$
radiant (energy) flux, $P$ , $Φ$
radiant exitance, $M$
radiant exposure, $H$
radiant intensity, $I$
radiant power, $P$
radiation trapping
radiationless deactivation
radiative energy transfer
radiative lifetime, $τ 0$
radical photosubstitution
reflectance, $ρ$
Rehm–Weller equation
Renner–Teller effect
reorganization energy in electron transfer
residual emission anisotropy
resonance lamp
rotational correlation time, $τ c$ or $θ$
rotational relaxation time, $ρ$
Schenck reaction
Schenck-sensitization mechanism
self-localized excitations in conjugated organic polymers
single-photon timing
singlet molecular oxygen (singlet molecular dioxygen)
singlet–triplet crossing
soliton
solvent-induced symmetry breaking
spectral fluence rate, $E λ , o$
spectral radiant energy, $Q λ$
spectral sensitivity, $S λ$
spin-flip method
spin-statistical factor (in diffusion-controlled reactions)
time-dependent density functional theory
time-resolved fluorometry
time-resolved microwave conductivity
transient-stimulated emission pumping
transition (dipole) moment
tungsten-halogen lamp
twisted intramolecular charge transfer
two-photon photochromism
ultraviolet
uniaxial sample
upconversion
valence band
visible
VUV
Weller correlation
Wigner matrices
wolfram lamp
Wood lamp
Yang photocyclization
$Z 50$ of a photochromic system