350mm focal length monochromator / spectrometer, McPherson Model 2035

350 mm Czerny-Turner Spectrometer

The 2035 is a 350mm focal length asymmetric Czerny-Turner monochromator with f/4.8 aperture. It has 0.05nm fwhm spectral resolution with 1200g/mm grating. Its precision slits are micrometer adjustable from 0.01 to 4 mm. The 2035 features a wavelength counter, and manually operable sine drive providing years of accurate and reproducible wavelength positioning. The scan controller provides computer/software control. Spectrally agile, the 2035 has polished masterpiece optics for best performance from deep in the ultraviolet to the Infrared. Aspheric optics and CCD adapters are available for imaging applications. Purge gas fittings for deep UV and IR work. On request, Gold or Silver (etc.) coatings can be provided. Use the 2035 monochromator for research or teaching. It is great for applications like Raman, luminescence, fluorescence, reflection and transmission.

Model 2035 PDF Data Sheet

Specifications & Additional Information:

Optical DesignCzerny Turner design Monochromator / Spectrometer
Focal Length350 mm
Aperture Ratiof/4.8 (NA 0.1)
Wavelength Rangerefer to grating of interest for range
Wavelength Accuracy±0.2 nm
Wavelength Reproducibility± 0.05 nm (with 1200 G/mm grating)
Grating Size68 x 68 mm (single grating holder, optional dual-grating turret)
SlitsContinuously variable micrometer actuated width 0.01 to 4 mm, height settings from 2 to 20 mm
Slit LocationsAxial and lateral, with optional port selection mirrors
Focal Plane25-mm, multiply dispersion by the width of your detector for range

Performance with various diffraction gratings:

Grating Groove Density (g/mm) 3600 2400 1800 1200 600 300 150 75 50
Spectral Resolution at 312.6nm (nm, FWHM) 0.02 0.025 0.035 0.05 0.1 0.2 0.4 0.8 1.2
Reciprocal Linear Dispersion (nm/mm) 0.7 1 1.5 2 4 8 16 32 48
Wavelength Range from 185nm to * 430 650 865 1.3 um 2.6 um 5.2 um 10.4 um 20.8 um 31.2 um
First Order Littrow Blaze (nm) 240240180200250 2803002 um600
holo300250300300 3005003 um12 um
holo400400500 5008008 um14 um
holo500750 7501.25 um10 um
7501 um 1 um2.5 um12 um
1 um1.8 um 3 um4 um
holoholo 4 um6 um
8 um

*diffraction gratings work best from 2/3 to 3/2 the Blaze wavelength

Outline Drawing

McPherson Model 2035 350mm f.l. Spectrometer

Select Publications

Abstract: Read at NATURE website Excitons in semiconductors and insulators consist of fermionic subsystems, electrons and holes, whose attractive interaction facilitates bound quasiparticles with quasi-bosonic character. In the presence of a degenerate electron gas, such excitons dissociate due to free carrier screening. Despite their absence, we found pronounced emission traces in the below-band-edge region of bulk, germanium-doped GaN up to a temperature of 100 K, mimicking sharp spectral features at high free electron concentrations (3.4E19–8.9E19 cm−3). Our interpretation of the data suggests that a degenerate, three-dimensional electron gas stabilizes a novel class of quasiparticles, which we name collexons. These many-particle complexes are formed by exchange of electrons with the Fermi gas. The potential observation of collexons and their stabilization with rising doping concentration is enabled by high crystal quality due to the almost ideal substitution of host atoms with dopants.
C. Nenstiel, G. Callsen, F. Nippert, T. Kure, S. Schlichting, N. Jankowski, M. P. Hoffmann, A. Dadgar, S. Fritze, A. Krost, M. R. Wagner, A. Hoffmann & F. Bechstedt
Abstract: Contactless measurements of water temperature are utilized in a number of sciences, such as oceanography, climatology, and biology. Previously reported Raman spectroscopy techniques exploited the changes in the shapes of water Raman bands. Interpretation of these changes is difficult since these bands are composed of multiple lines, each influenced not only by temperature but also by pressure and salinity. This paper presents a proof-of-principal demonstration of a contactless technique which determines water temperature from the ratio of Stokes and anti-Stokes intensities of the water 180 cm1 Raman band. This ratio is not sensitive to pressure and salinity, allowing reliable determination of water temperature.
S. P. Nikitin, C. Manka, J. Grun, and J. Bowles
Abstract: The luminous efficiency and lifetime of plasma display panels (PDPs) are directly related to the performance of phosphors used in PDPs, thus higher efficiency, higher stability against high temperature processes and a long lifetime along with good color chromaticity against vacuum-ultraviolet (VUV) radiation are major concerns in selecting suitable phosphors for PDPs. In the same pursuit, we have developed the nano-sized (15–40 nm) BAM:Eu2+, YAG:Tb3+ and YAG:Eu3+ as blue, green and red phosphors and studied their luminescence properties under VUV excitations. In BAM:Eu2+, the 5d-excitation of Eu2+ ions are found strongly dependent on the crystal field strength and Eu2+ occupy lattice ‘sites I’ by substituting Ba2+ ions. Whereas, in YAG:Tb3+, the observed green luminescence is assigned to 5D4?7Fj transitions (j = 3–6) due to electric dipole–dipole interaction, while, YAG:Eu3+ shows strong red luminescence corresponding to 5D0?7F2 transition. Time evolution studies along with decay time calculations are further employed to verify the sustainable emission without quenching.
Prashant K. Sharma, Ranu K. Dutta, Avinash C. Pandey
Abstract: Porous silicon samples have been prepared from p-type single-crystal silicon <100> by a galvanostatic and an open-circuit etch in 50% HF. The materials display bright red-orange room-temperature photoluminescence (PL) in air and toluene solution. Infrared measurements show that the porous silicon surface is partially oxidized. Exposure to anthracene (An) or 10-methylphenothiazine (MPTZ) results in dynamic quenching of the material's excited state(s). Nanosecond time-resolved PL decays are complex and wavelength dependent, with average lifetimes in neat toluene of 0.3-16 µs. Quenching by An and MPTZ is more efficient and rapid at short observation wavelengths. The steady-state and time-resolved quenching data are well fit to the Stern-Volmer model. The PL decays are well described by a skewed distribution of recombination rates.
Minh C. Ko and Gerald J. Meyer
Abstract: Discussed are the photoluminescence properties of combustion synthesized red and green emitting borate phosphors—YBO3 : Eu3+, BaZr(BO3)2 : Eu3+, YCaBO4 : Eu3+, YAl3(BO3)4 : Eu3+, YAl3(BO3)4 : Tb3+, LaBaB9O16 : Tb3+, LaBaB9O16 : (Ce3+,Tb3+), and Na3La2(BO3)3 : Tb3+-promising for use in plasma display panels and mercury-free fluorescent lamps.
P. A. Nagpure, S. K. Omanwar
Abstract: Coherent anti-Stokes Raman scattering (CARS) with femtosecond interaction pulses has become a popular and powerful spectroscopic method. Non-resonant background is one of the most limiting factors for implementing this method more widely. We propose a new approach that suppresses the non-resonant background contribution to the measured signal in CARS spectroscopy while simultaneously yielding high spectral resolution. The method is based on femtosecond pulse shaping of probe, Stokes and pump beams. Destructive interference suppresses the non-resonant background, resulting only in the resonant contribution being detected.
Stanislav O. Konorov, Michael W. Blades and Robin F. B. Turner
Abstract: We investigate the possibility of implementing coherent anti-Stokes Raman spectroscopy (CARS) with a single laser beam passed through a one-dimensional scattering object. The effect of the random scattering is emulated by shaping the laser pulses with a spectral mask corresponding to the transmission spectrum of a random layered medium. Raman resonances are retrieved through correlation analysis of the CARS spectrum. We study the effect of the scattering parameters on the resolution of the method, and show that improvement of the spectroscopic sensitivity can be achieved by compensating the phase distortions introduced by the scatterer
T.M. Drane, J.W. Hepburn and V. Milner
Abstract: Visible light extinction was measured in a series of nitrogen-diluted, ethylene/air, non-premixed flames and this data was used to determine the optical band gap, OBG, as a function of flame position. Collimated light from a supercontinuum source is telescopically expanded and refocused to match the f – number of a dispersing monochromator. The dispersed light is split into a power metering channel and a channel that is periscoped and focused into the flame. The transmitted light is then recollimated and focussed onto a silicon photodiode detector. After tomographic reconstruction of the radial extinction field, the OBG was derived from the near-edge absorption feature using Tauc/Davis–Mott analysis. A slight evolution in OBG was observed throughout all flame systems with a consistent range of OBG observed between approximately 1.85 eV and 2.35 eV. Averaging over all positions the mean OBG was approximately 2.09 eV for all flame systems. Comparing these results to previously published computational results relating calculated HOMO–LUMO gaps for a variety of D2h PAH molecules to the number of aromatic rings in the structure, showed that the observed optical band gap is consistent with a PAH of about 14 rings or a conjugation length of 0.97 nm. This work provides experimental support to the model of soot formation where the transition from chemical to physical growth starts at a modest molecular size; about the size of circumpyrene.
Erin M. Adkinsa and J. Houston Miller. DOI: 10.1039/C4CP04452E

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