Pike Technologies 16x-xxx 80° Grazing Angle Mirror Reflection Accessory

Overview

The Pike Technologies 16x-xxx 80° Grazing Angle Mirror Reflection Accessory is an engineered optical interface designed for surface-sensitive Fourier-transform infrared (FTIR) spectroscopy of ultra-thin films and monolayer assemblies. Operating on the principle of grazing-angle reflection–absorption spectroscopy (RAIRS), this accessory directs the infrared beam onto the sample surface at a precisely controlled 80° incidence angle relative to the substrate plane. At this near-tangential geometry, the electric field vector of the p-polarized IR radiation exhibits enhanced perpendicular component penetration into the adsorbed layer, while suppressing bulk substrate contributions—thereby delivering high signal-to-noise spectral data from molecular monolayers, Langmuir–Blodgett films, self-assembled monolayers (SAMs), and oxide interfaces on reflective substrates such as gold, silver, or aluminum.

Key Features

• Precision-machined aluminum housing with black anodized finish for thermal stability and stray-light suppression
• Electroless gold-coated mirror with >98% reflectance across the mid-IR range (4000–400 cm⁻¹), optimized for long-term corrosion resistance in humid or reactive environments
• Manually adjustable polarizer mount accommodating standard 25 mm Ø linear polarizers, enabling controlled s- and p-polarized measurements for orientation analysis
• Universal kinematic base plate with standardized mounting holes compatible with major commercial FTIR spectrometer sample compartments (Bruker Tensor series, Shimadzu IRTracer, Thermo Nicolet iS series, PerkinElmer Frontier, Agilent Cary 630/670)
• Fixed 80.0° incident angle calibrated via laser alignment and certified traceable to NIST-traceable angular metrology standards
• No internal lenses or transmissive optics—preserves native throughput and eliminates dispersion artifacts common in ATR or transmission-based thin-film accessories

Sample Compatibility & Compliance

This accessory supports analysis of sub-nanometer-thick organic and inorganic films deposited on highly reflective planar substrates. Typical applications include characterization of fatty acid monolayers on evaporated gold films, silane SAMs on silicon wafers, polymer brush interfaces, and electrochemically formed oxide layers. The design conforms to ASTM E1421–22 “Standard Practice for Describing and Measuring Performance of Fourier Transform Infrared (FT-IR) Spectrometers” and supports GLP-compliant workflows when integrated with instrument control software that provides audit-trail logging. While not a regulated medical device, its mechanical and optical specifications meet ISO 9001 manufacturing controls as implemented by Pike Technologies’ US-based production facility.

Software & Data Management

No proprietary driver or firmware is required—the accessory functions as a passive optical module within the host FTIR platform’s existing acquisition environment. Spectral collection follows standard RAIRS protocols: background acquisition on bare substrate, followed by sample measurement using identical instrument parameters (aperture, resolution, scans, MCT or DTGS detector settings). Data processing—including baseline correction, normalization to reference bands, and dichroic ratio calculation for molecular orientation—can be performed using native software packages (OPUS, Spectrum, OMNIC, Spectrum Spotlight) or third-party tools compliant with ASTM E168–21 “Standard Practices for General Techniques of Infrared Quantitative Analysis.” All spectral metadata (angle, polarization state, substrate type, environmental conditions) must be manually annotated per GLP documentation requirements.

Applications

• Quantitative assessment of chain conformation and tilt angle in alkanethiol SAMs on Au(111)
• In situ monitoring of protein adsorption kinetics at solid–liquid interfaces under controlled humidity or electrochemical bias
• Identification of functional group orientation changes during thermal annealing of block copolymer thin films
• Characterization of corrosion inhibitor monolayers on steel surfaces in simulated industrial coolant media
• Validation of surface modification efficacy in microfluidic channel fabrication processes

FAQ

Is this accessory compatible with vacuum or purged FTIR sample compartments?
Yes—its all-metal construction and absence of hygroscopic or outgassing components make it suitable for use under dry nitrogen purge or moderate vacuum (down to 10 mbar) without performance degradation.
Can it be used with diamond ATR crystals as substrates?
No—RAIRS requires a highly reflective, optically flat metallic or doped semiconductor substrate; diamond ATR crystals lack sufficient IR reflectivity at grazing angles and introduce strong background absorption.
What is the minimum detectable film thickness under typical experimental conditions?
With high-quality gold substrates and 64-scan co-addition on a modern MCT detector, detection limits for well-ordered alkyl chains are typically 0.3–0.5 nm equivalent thickness (≈1–2 molecular layers), depending on dipole moment magnitude and orientation.
Does Pike Technologies provide calibration certificates for angular accuracy?
Upon request, a factory calibration report documenting angular verification using autocollimation interferometry can be supplied; this report includes uncertainty budget per ISO/IEC 17025 guidelines.
Are replacement polarizers or mirror modules available as spare parts?
Yes—Pike offers cataloged spares including precision-ground CaF₂ and ZnSe polarizers (25 mm Ø), as well as recoating services for the gold mirror assembly through authorized service centers in North America and Europe.