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N Modulation amplitudes: 7 G max at 100 kHz The ER 4114HT is not suit-able for 6 magnets. It covers the temperature range from 400 K to 1200 K using the ER 4141VT-U in combination with the power booster module. The three wall dewar finger system made from high purity quartz contains both the heater element and the sample holder, and is designed as a gas flow system having low temperature gradients in the sample region. The low thermal expansion coefficient results in only small resonance frequency drift due to wall heating. The ER 4114HT cavity resonates in the TE011 mode. N Conversion factor: 0.6 G/W at QL = 3000 N Modulation amplitudes: 16 G max at 100 kHz The cavity is not recommended for the 6 magnet. The two coupled cavites assure that both samples are measured under identical conditions, i.e. The main application is determination of spin concentration and g-factor values against a reference sample. The front chamber has an optical grid with 50 % transmission. Both chambers are equipped with modulation and rapid scan coils. The ER 4105DR is a double rectangular cavity operating in the TE104 mode. Ideally suited for aqueous samples, conducting samples and tissues when sample quantity is not limited. The cavity allows optical access with 80% transmission for the incident light. This new sample cell is especially useful for quantitative EPR of aqueuos samples. Alternatively, the recently developed ER 4110AX AquaX cell can be used. Special flat cell holders have been developed to center the cell in the cavity. It can be used with an insert dewar / flat cell assembly for variable temperature. The ER 4103TM is a flat cylindrical cavity resonant in the TM110 mode. N Modulation amplitudes: 10 G max at 100 kHz The purpose of these pair of plates is obvious: They will provide effective cooling and dissipation of excess heat, in turn prevent and protect the cavity for any damage as a result of sample heating. With this option, EPR experiments at elevated temperatures up to 500 K become readily accessible (together with the ER 4141VT digital temperature accessory). It can also be equipped with the option ER 4102ST-1004, the so-called Cooling Side Plates (CSP). Due to the relatively low Q-factor the cavity is also suited for transient EPR. The ER 4102ST is a universal cavity with good performance for every class of samples. All standard temperature controler equipment can be used. The resonator is equipped with additional rapid scan coils. Optical access is pro-vided by a grid of 10 x 23 mm with 50 % transmittance. It features a medium loaded Q value of 2500. In the parallel mode the transition probability of the allowed EPR transitions goes to zero and the EPR spectrum shows only lines due to forbidden transitions. This resonator is designed for investigation of forbidden transitions in Triplets, Biradicals, Transition Metal and Rare Earth Ions. The cavity is compatible with the ER 4141VT and ER 4112HV temperature control systems and is equipped with rapid scan coils. The weak-pitch sensitivity of this cavity is about 150 % of the ER 4102ST. Optical access is provided by a 8 mm i.d. With a quartz dewar inserted the operating frequencies are 9.6 GHz (perpendicular) and 9.3 GHz (parallel). The cavity features two modes, a TE102 with B1 perpendicular (QL= 4500) and a TE012 with B1 parallel (QL= 4000) to B0. N Conversion factor: 1.0 G/W at QL = 3000 N Modulation amplitudes: 32 G max at 100 kHz N Modulation amplitudes: 9 G max at 100 kHz It is also useful for intense UV-irradiation with minimum background signal.Sensitivity is approximately 50% of a standard rectangular cavity. The resonator is mainly used for optical detection experiments. All standard temperature control equipment can be used. The dimensions of the optical transmission paths are: 4x10 mm. The resonator allows unhindered irradiation of the sample and comes equiped with both modulation and rapid scan coils. The cavity is designed for convenient optical access from the front and the rear side. These cylindrical resonators are developed to obtain maximum sensitivity for EPR studies on sam-ples having low dielectric losses, gas phase experiments, solid state low temperature work and flow or mixing experiments. Mini-mum required magnet air gap is 61 mm. The resonator is compatible with rotating base magnets. It is fitted with an optical transmission path of 7x10 mm for incident light. The Solutions for Multiple-Choice EPR Experiments