레이저분광
SFG Spectrometer
Sum Frequency Generation (SFG) Vibrational Spectrometer
Characterisation of vibrational bonds of molecules at surfaces or interfaces
Intrinsically surface specific
High spectral resolution
Wide range of accessible (molecular) vibrations: 625-4000 cm⁻¹
SFG Microscope
제조사 EKSPLA
가격 TBD
문의 TBD
제품 특징

SFG Spectrometer

Sum Frequency Generation (SFG) Vibrational Spectrometer
  • Characterisation of vibrational bonds of molecules at surfaces or interfaces
  • Intrinsically surface specific
  • High spectral resolution
  • Wide range of accessible (molecular) vibrations: 625-4000 cm⁻¹
  • SFG Microscope
SFG Spectrometer

Sum Frequency Generation (SFG) Vibrational Spectroscopy

ADVANTAGES

  • Intrinsically surface specific
  • Selective to adsorbed species
  • Sensitive to submonolayer of molecules
  • Applicable to all interfaces accessible to light
  • Nondestructive
  • Capable of high spectral and spatial resolution

APPLICATIONS

  • Investigation of surfaces and interfaces of solids, liquids, polymers, biological membranes and other systems
  • Studies of surface structure, chemical composition and molecular orientation
  • Remote sensing in hostile environment
  • Investigation of surface reactions under real atmosphere, catalysis, surface dynamics
  • Studies of epitaxial growth, electrochemistry, material and environmental problems

Sum Frequency Generation Vibrational Spectroscopy (SFG-VS) is powerful and versatile method for in-situ investigation of surfaces and interfaces. In SFG-VS experiment a pulsed tunable infrared IR (ωIR) laser beam is mixed with a visible VIS (ωVIS) beam to produce an output at the sum frequency (ωSFG = ωIR + ωVIS). SFG is second order nonlinear process, which is allowed only in media without inversion symmetry. 

At surfaces or interfaces inversion symmetry is necessarily broken, that makes SFG highly surface specific. As the IR wavelength is scanned, active vibrational modes of molecules at the interface give a resonant contribution to SF signal. The resonant enhancement provides spectral information on surface characteristic vibrational transitions.

Specifications

Version 1)SFG ClassicSFG AdvancedSFG Double resonance
System (General)
Spectral range1000- 4300 cm-1625- 4300 cm-11000- 4300 cm-1
Spectral resolution<6 cm-1(optional <2 cm-1)<6 cm-1(optional <2 cm-1)<10 cm-1
Spectra acquisition methodScanning
Sample illumination geometryTop side, reflection (optional: bottom side, top-bottom side, total internal reflection)
Incidence beams geometryCo-propagating, non-colinear (optional: colinear)
Incidence anglesFixed, VIS ~60 deg, IR ~55 deg (optional: tunable)
VIS beam wavelength532 nm (optional: 1064 nm)532 nm (optional: 1064 nm)Tunable 420 – 680 nm (optional: 210 – 680 nm)
Polarization (VIS, IR, SFG)Linear, selectable “s” or “p”, purity > 1:100
Beam spot on the sampleSelectable, ~150 – 600 µm
SensitivityAir-water spectra
Pump lasers
ModelPL2231PL2251B
Pulse energy40 mJ80 mJ (70 mJ at 20 Hz)
Pulse energy stability<0.5 %<0.8 %
Pulse duration28±3 ps30±3 ps
Pulse duration stability±1.0 ps
Pulse repetition rate50 Hz10 or 20 Hz
Optical parametric generators
IR source with standard linewidth (<6 cm-1)PG501-DFG1PPG501-DFG2PG501-DFG1P
IR source with narrow linewidth (<2 cm-1)PG551-DFG--
UV-VIS source for Double resonance SFG--PG401 (optional: PG401-SH)
For standard specifications please check the brochure of particular model
Monochromators
ModelMS2002xMS350
TypeCzerny-Turner with single grating turret (optional: four grating turret)
Focal length200 mm2x350 mm
Slits0-2.0 mm, manual
Stray light rejection10-510-510-10
Physical dimensions (footprint)
Standard2400 x 1000 mm3600 x 1500 mm
Extended (with special options or large accessories)2700 x 1200 mm3600 x 1500 mm
  1. Due to continuous product improvements, specifications are subject to changes without advance notice.