Vacuum Compatible High Resolution Czerny-Turner Monochromator
Best Resolution in the ~105-nm to IR Range
Scanning, Imaging and CCD Array Spectroscopy
Clean Stainless Steel Construction
O-ring sealed systems achieve 10^-6 torr vacuum
Optional Ultra High Vacuum (UHV) metal sealed versions for 10^-10 torr
High Efficiency Broadband Al+MgF2 Coatings
This instrument offers all of our great features and options: a wide variety of patented SNAP IN diffraction gratings, efficient broadband reflective coatings, and master polished optics. McPherson Czerny-Turner instruments with focal lengths greater than 0.67-meters allow you to use larger 120-mm x 140-mm grating or a 110-mm x 110-mm grating. The large grating offers almost 40% more area, achieving a faster f/number, and more throughput. In these models the grating can also rotate through an auxiliary 20° for extension of wavelength range. For the 1200-g/mm grating the high wavelength changes from 1300-nm to 1575-nm (more than 20% extra wavelength coverage!)
Abstract: Absorption, fluorescence, and fluorescence excitation spectra of 12-hydroxy-1-azaperylene (HAP) and 1-azaperylene were studied in n-alkane matrices at 5 K. Two stable tautomers of HAP, each of them in n-nonane embedded in two sites, were identified and attributed to the enol and keto forms. Theoretical calculations of the energy and vibrational structure of the spectra suggest that tautomer A, with the (0, 0) transition energy at 18 980 ± 10 cm–1 (and 19 060 ± 10 cm–1 in the high energy site), should be identified as the keto form, whereas tautomer B, with the (0, 0) energy at 19 200 ± 20 cm–1 (19 290 ± 20 cm–1), as the enol form. Observation of absorption and fluorescence of both tautomeric forms and lack of large Stokes shift of fluorescence of the keto form classify HAP as the limiting case of the excited-state intramolecular proton transfer system.
Irena Deperasińska †, Daniel T. Gryko ‡, Elena Karpiuk †, Bolesław Kozankiewicz *†, Artur Makarewicz †, and Joanna Piechowska ‡
Abstract: We studied absorption and fluorescence spectra and decays of pentacene (Pc) in Shpol'skii matrices of n-heptane (C7), n-nonane (C9), n-decane (C10), n-dodecane (C12), n-tetradecane (C14) and n-hexadecane (C16) in the temperature range 1.7–200 K. The fluorescence quantum yields of Pc in C12, C14 and C16 at 1.7 K were determined to be 20±6%, 26±6% and 22±6%, respectively. The kinetic analysis provided values of the radiative, internal conversion and intersystem crossing rate constants for the relaxation channels of the S1 state of Pc in different matrices. Calculated fully saturated emission rates of single molecule were in very good relation with previous observation of single Pc molecules in Shpol'skii matrices.
M. Banasiewicz, I. Deperasińska, D. Fabjanowicz, B. Kozankiewicz
Abstract: Single terrylene molecules were detected for the first time in 2,3-dimethylnaphthalene crystals. Experiments provided information about the structural dynamics of the crystal over a wide temperature range. Blinking of the fluorescence intensity of terrylene molecules, between 5 and 150 K, was related to dynamics of the methyl groups of the host molecules surrounding the probe. Photo-bleaching of single terrylenes, monitored over the whole temperature range, at temperatures above 220 K was attributed to thermally activated reorientation of the host molecules, already discovered by nuclear magnetic resonance. Photo-bleaching time was too short to detect terrylene molecules at temperatures above 260 K.
M. Banasiewicz, D. Wiącek, B. Kozankiewicz
Abstract: Photoluminescence(PL) studies were carried out on CuAlS2heteroepitaxial layers grown by low‐pressure metalorganic chemical vapor deposition. The epilayers exhibited an intense near‐band‐edge PL peak at 3.525 eV (77 K) in the ultraviolet (UV) wavelength region together with PL bands at 2.76 and 2.1 eV. This near‐band‐edge PL peak showed the following properties: (i) the PL was strongly polarized parallel to the c axis, (ii) the peak energy varied from 3.497 to 3.525 eV at 77 K with increasing epilayer thickness from 0.49 to 0.67 μm, and (iii) the emission was observed up to room temperature. This UV‐PL was tentatively assigned to an exciton‐related emission, energy shifted due to the residual lattice strain.
Shigefusa Chichibu, Hisayuki Nakanishi and Sho Shirakata