제조사 | EKSPLA |
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가격 | TBD |
문의 | TBD |
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.
Version 1) | SFG Classic | SFG Advanced | SFG Double resonance |
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System (General) | |||
Spectral range | 1000- 4300 cm-1 | 625- 4300 cm-1 | 1000- 4300 cm-1 |
Spectral resolution | <6 cm-1(optional <2 cm-1) | <6 cm-1(optional <2 cm-1) | <10 cm-1 |
Spectra acquisition method | Scanning | ||
Sample illumination geometry | Top side, reflection (optional: bottom side, top-bottom side, total internal reflection) | ||
Incidence beams geometry | Co-propagating, non-colinear (optional: colinear) | ||
Incidence angles | Fixed, VIS ~60 deg, IR ~55 deg (optional: tunable) | ||
VIS beam wavelength | 532 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 sample | Selectable, ~150 – 600 µm | ||
Sensitivity | Air-water spectra | ||
Pump lasers | |||
Model | PL2231 | PL2251B | |
Pulse energy | 40 mJ | 80 mJ (70 mJ at 20 Hz) | |
Pulse energy stability | <0.5 % | <0.8 % | |
Pulse duration | 28±3 ps | 30±3 ps | |
Pulse duration stability | ±1.0 ps | ||
Pulse repetition rate | 50 Hz | 10 or 20 Hz | |
Optical parametric generators | |||
IR source with standard linewidth (<6 cm-1) | PG501-DFG1P | PG501-DFG2 | PG501-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 | |||
Model | MS200 | 2xMS350 | |
Type | Czerny-Turner with single grating turret (optional: four grating turret) | ||
Focal length | 200 mm | 2x350 mm | |
Slits | 0-2.0 mm, manual | ||
Stray light rejection | 10-5 | 10-5 | 10-10 |
Physical dimensions (footprint) | |||
Standard | 2400 x 1000 mm | 3600 x 1500 mm | |
Extended (with special options or large accessories) | 2700 x 1200 mm | 3600 x 1500 mm |