Technology for Polarization Measurement

Linear Dichroism

Linear dichroism (LD) is the differential absorption between two orthogonal, linearly polarized states (A = AX – AY). LD is a measurement of the sample’s bulk property that is a result of the regular orientation of the molecules in the sample.

SETUP

T4_2-1-3-4_A
PEM Setting: half-wave retardation (λ/2)
Polarization Modulation: bottom || and ⊥ linear polarization
Lock-in reference: PEM’s 2nd harmonic (2f)

POLARIZATION MODULATION

After the PEM, the light beam is modulated between two perpendicular, linearly polarized states at the modulator’s 2nd harmonic (2f)

T4_2-1-3-4_B

APPLICATIONS

Structural study and characterization in inorganic chemistry, polymer chemistry, material science, and biochemistry.

TYPICAL HEAD ASSEMBLIES

I/FS50 for UV-vis

II/FS42  for UV-vis and near IR

FURTHER READING

T. C. Oakberg, Application note– Linear and Circular Dichroism, Hinds Instruments, Inc. (1991).

A. F. Drake, "Polarisation modulation-the measurement of linear and circular dichroism," J. Phys. E: Sci. Instrum. 19, 170 (1986).

B. Norden, Appl. Spectrsc. Rev.14, 157 (1978).

Linear & Circular Dichroism

 
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