IR CID

An electrode organization with the two well unit cell as shown in Fig. 6.13 allows horizontal and vertical scan registers external to the CID chip to read out the unit cells. Thus an m x n CID array would require m + n connections to the IR sensitive material. Since the CID is xy addressed, random access to any 

SERIES PARALLEL SCAN InSb CID FOCAL PLANE ARRAY 

One implementation of the series-parallel scanned CID is shown in Fig. 6.14. In this case one preamplifier is used per CID chip. The CID xy readout is used in 

If more than one column is read out through one preamplifier then a column select switch must be in series between the preamplifier and the CID cell. This switch need not consume any power but it must be low resistance in the on state for low noise operation. If we use one preamplifier per column then this column selection switch is not required and we will then have the rather simple configuration shown in Fig. 6.17. 

If correlated double sampling is not used, besides background noise the most important source of noise for the series-parallel scan CID is likely to be kTC noise. If this is the case then the maximum signal frequency for which we can design the device to obtain BLIP operation will be 

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Fig. 6.14. Series-parallel scan IR CID. Infrared sensitive IR CID modules are completely read out more than once a dwell time through a preamplifier into a silicon CCD signal processor. In the signal processor TDI is performed and then th% individual lines of imagery are ac coupled and multiplexed. Only the CID module itself is fabricated from IR sensitive material...

Fig. 6.17. Series-parallel scan IR CID with one preamplifier per column. All the columns are read out simultaneously. This lowers the readout speed and avoids the column select switches shown in Fig. 6.13...

The ion 28 loses H2 by CID with argon to form [(PHOX)Ir(styrene)]+ (29). Compound 29 then undergoes H-D exchange with D2 gas to form the mixture of iso-topomers 29, 29-dh and 29-d2 (Scheme 13.3). When combined, these observations show that the oxidative addition of H2 to 29 is followed by alkene hydride insertion, and that both these steps occur rapidly and reversibly in the gas phase. These results thereby provide gas-phase analogues for catalytic elementary steps that are proposed to occur in solution. Support for this proposed sequence of steps was obtained from a solution-phase catalytic deuteration of styrene. Analysis showed no deuterium incorporation in the unreacted styrene at various conversions, and clean formation of dideuterio ethylbenzene as sole product. 

The differences in the gas-phase chemistry of the Cp complexes 5-8 and the Cp analogs 9-12 are confined to two areas. While the Cp-substituted complexes added to pentane, cyclohexane, or benzene, the Cp -substituted analogs reacted with pentane or benzene only. No cyclohexane adducts were observed in the gas-phase reactions of [Cp Ir(PMe3)(CH3)]+ or [Cp Ir(j]2-CH2PMe2)]+. Second, in the CID of the two phenyl-substituted complexes 8 and 12 (R=Ph), there was complete deuterium scrambling in 12, but only partial scrambling in 8. 

The study of natural products in plant extracts is an interesting challenge to LC-MS. Generally, the relevant compounds must be detected as minor components in complex mixtures. A combination of LC separation, especially to resolve isomeric stractures, and MS detection is needed. Furthermore, structural information is needed for the identification and dereplication of the unknown plant constituents. Because of the complexity of the sample pretreatment procedures involved in the isolation, MS in most cases is the only applicable spectrometric technique too much of a purified component would be needed for IR and NMR analysis. On-line analysis in relatively erode samples is obligatory for the detection of minor constitnents. When electrospray ionization (ESI) or atmospheric-pressnre chemical ionization (APCl) are applied for analyte ionization, structural information mnst be obtained by application of colhsion-indneed dissociation (CID), either via in-sonree CID or preferably via MS-MS or MS". LC-MS and LC-MS-MS have proved to be extremely snccessful in this area. 

Molecules are vibrationally excited by either physical collision with a neutral gas (CID) or by absorption of an IR photon (IRMPD). 

The elucidation of acetogenin structures is rather difficult and requires, besides classical methods such as UV, IR, proton and carbon NMR and mass spectrometry, some innovative mass strategies such as mass-tandem or collision-induced-dissociation (CID) of [M+Li]+ ions using linked... 

I lirtNRICM PI-INKI, Acid Regeneration. Spent. cid cl Explosive Ir.iliistiy, Adolf Plinke Sohne. D-6380 lud Hcndmif., F.K.G. J979. 

There exists a wide variety of approaches to the use of charge transfer devices in infrared focal planes. We shall discuss five high packing density, high quantum efficiency, approaches appropriate for series-parallel scan 1) IR sensitive CCD, 2) ctirect injection hybrid, 3) direct injection extrinsic silicon, 4) accumulation mode extrinsic silicon, and 5) infrared sensitive CID with silicon CCD signal processing. The reader is referred to a review article by Steckl et al. for a comprehensive discussion of a number of other approaches not discussed here which include indirect injection pyroelectric detectors and Schottky barrier photoemissive injection [6.1]. Three approaches in our list of five do not require... 

In all cases a low value of capacitance at the detection node is desirable. This points up the advantages of a CCD with preamplifier electronics integrated on the same chip. Here C2 can be on the order of 0.1-0.2 pF. As will be discussed later, use of a CID tends to lead to more capacitance at the sensing electrode. With more capacitance at the detection node, power dissipation constraints become important for the preamplifier especially if a large number are to be used at cryogenic temperatures (as is often the case with IR imagers). 

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