IMAGING SCIENCE AND PHOTOCHEMISTRY

DRY DEVELOPING ELECTRON BEAM RESIST——POLYCYCLOHEXENE-SULFONE AZIDES

YANG YONG-YUAN, FENG SHU-JING, GAO ZHI-MIN, RESEARCH GROUP OF ELECTRON BEAM LITHOGRAPHY

1986, 4(2): 1-6. DOI: 10.7517/j.issn.1674-0475.1986.02.1

Asbtract ( 751 )

PDF (481KB) ( 1296 )

References | Related Articles | Metrics

A dry developing electron beam resist was investigated. As a negative resist,it consists of PCHS (polycyclohexene sulfone) and diazide (2,6-di-(4'-azidobenzal)-4-methy-lcyclohexanone). It was found that PCHS-diazide resist has a sensitivity of 1.5×10^-5 C/cm²,a resolution of less than 1μm and the contrast of about 1.43. The mechanism and the influence factor of dry development were discussed.

THE IONIC CONDUCTION AND SURFACE SPACE CHARGE LAYERS OF POLYD1SPERSED SILVER HAL1DE EMULSION

CHENG XUE-XIN, PENG BI-XIAN

1986, 4(2): 7-11. DOI: 10.7517/j.issn.1674-0475.1986.02.7

Asbtract ( 651 )

PDF (320KB) ( 1188 )

References | Related Articles | Metrics

In the present paper a polydispersed iodobromide photographic emulsion (iodide content 6 mol percent) was divided into nine bunch emulsions with fine,middle and,coarse grains by means of enzymatic treatment. The ionic conductivity of the silver ha-lide microcrystals of each bunch was measured at different temperatures. The ionic conduction activation energy and the surface potential were calculated. It was found that there is a significant difference among different bunches in ionic conduction. The activation energy increases from 0.30 eV to 0.41eV,with decreasing iodide content,meanwhile,the surface potential becomes more and more positive and the interstitial silver ions formation energy becomes higher and higher. The effects of above-mentioned differences on the sensitometric characteristics of different bunches were discussed.

A STUDY ON THE MECHANISM OF LATENT IMAGE FORMATION BY COMPUTER SIMULATION TECHNIQUE

ZHAO JINQ-QUAN, XIA PEI-JIE

1986, 4(2): 12-22. DOI: 10.7517/j.issn.1674-0475.1986.02.12

Asbtract ( 818 )

PDF (733KB) ( 1211 )

References | Related Articles | Metrics

Monte Carlo computer simulation technique was used for studying the mechanism of latent image formation in cubic crystals of silver bromide. Based on some significant results from the researches on latent image,certain fundamental assumptions were made in this model as follows: 1) before the ionic step starts the electrons released by photons rapidly reach an equilibrium between electrons in conductance band and those in shallow traps,as which interstitial silver ions may act besides kink sites and dislocation jogs; 2) formations of Ag,Ag₂,and Ag₃ (nucleation) are inefficient,whereas the growth after the formation of Ag₄⁺ is efficient; 3) positive holes produced by photons will have an evolution from holes to Br2 through V-Centers and bromine atoms,and during the evolution recombination and regression may take place. The estimation of parameters for simulation is based on some physical measurements,such as by microwave technique and dielectric loss etc. The results from simulation quantitatively show the productions and the changes of various species,such as reactants,intermediates,and products,and also show a consistency with some of macroscopic experimental results,response curves and reciprocity curves as for instance.

A STUDY ON THE PHOTOCHEMICAL REACTIONS OF THE ACID SENSITIVE COLOUR-CHANGING MATERIALS

WANG YAN-QIAO, ZHOU XIAO-MIN, CHEN LIU-SHENG, QIU LIAN-XIONG

1986, 4(2): 23-29. DOI: 10.7517/j.issn.1674-0475.1986.02.23

Asbtract ( 710 )

PDF (413KB) ( 1252 )

References | Related Articles | Metrics

An acid sensitive colour-changing material,composed of halogenated copolymer and acid indicator,has been developed. In order to improve its image quality,the photochemical reaction involved was studied. It was shown that the VDCl₂-MA undergoes a simple process of photolysis with the release of HCl,based on -the spectral characteristics of VDCl₂-MA copolymer before and after exposure to UV irradiation and the ESR and ESCA measurements upon exposure to UV. The experimental results show that upon UV irradiation the tran-form DMY is converted into cis-form,and the cis-form is unstable and turns back easily into the trans-form when the irradiation is ceased. The rate of the reverse reaction follows the first order kinetics and the rate constant is 1.1×10^-2 sec^-1,measured by flash photolysis. The image recorded by the VDCl₂-MA and DMY photographic materials undergoes some fading in storage. By the addition of phenols,the image stability was improved.

STUDY ON TRIPLE EXCIPLEX

CHEN SHANG-XIAN, ZHANG LI-MIN

1986, 4(2): 30-36. DOI: 10.7517/j.issn.1674-0475.1986.02.30

Asbtract ( 746 )

PDF (407KB) ( 1225 )

References | Related Articles | Metrics

In this paper,it was demonstrated that the interaction of excited acenaphthene with 1,4-dicyanobenzene will lead to the formation of exciplex and triple exciplex. The latter will be formed at higher concentration of acenaphthene. In the case of polyacenaph-thylene,intramolecular excimer could be formed between nonadjacent chromophores. As a result of interaction of excited polyacenaphthylene and 1,4-dicyanobenzene,triple exciplex can be formed too. The mechanism of the formation of triple exciplex was proofed as exciplex→triple exciplex but not excimer→triple exciplex.

A STUDY ON THE MULTIPLE STATE OF THE INTERMEDIATE FORMED IN THE PHOTO-DECOMPOSITION OF 4,4'-DIAZIDOBIPHENYL

HUANG JUN-LIAN, YU TONG-YIN

1986, 4(2): 37-42. DOI: 10.7517/j.issn.1674-0475.1986.02.37

Asbtract ( 665 )

PDF (397KB) ( 1262 )

References | Related Articles | Metrics

By means of ESR and chromatographic analysis,it was confirmed that the azido-nitrene and dinitrene which produced by the photo-decomposition of 4,4'-diazidobiphen-yl were triplets,the photo-decomposing reaction carried on in two steps.But the intermediate which produced by the thermo-decomposition of 4,4'-diazidobi-phenyl was singlet dinitrene only. So the mechanism of the thermo-decomposition of 4,4'-diazidobiphenyl was totally different from that of the photo-decomposition.

FLUORESCENCE SPECTRA OF D1-(β-NAPHTHYLMETHYL)-DIAMINE DERIVATIVES AND THEIR EXCITED COMPLEX FORMATION

XU HUI-JUN, YUAN ZHEN-LI

1986, 4(2): 43-48. DOI: 10.7517/j.issn.1674-0475.1986.02.43

Asbtract ( 621 )

PDF (344KB) ( 1207 )

References | Related Articles | Metrics

Three compounds with the formulawere synthesized and their fluorescene spectrawere studied. The results indicate that they exhibit both intramolecular excimer and exciplex formation depending on the solvent polarity. In the solvents with high polarity,e.g. acetonitrile and methanol,the intramolecular exciplexes are more likely to undergo radiationless decay by dissociation and their fluorescence emission can not be observed. The blue-shifted fluorescence peaks are believed to be due to intramolecular excimer formation. The ability of intramolecular excimer formation can be arranged in the following decreasing order: Ⅱ>Ⅰ>Ⅲ.

STUDIES ON THE MECHANISM OF PHOTOPOLYMERIZATION INITIATED BY AROMATIC AMINES WITH ELECTRON-AND FLUORESCENCE-SPECTROPHOTOMETRIC METHODS

LI TONG CAO, WEI-XIAO, FENG XIN-DE

1986, 4(2): 49-55. DOI: 10.7517/j.issn.1674-0475.1986.02.49

Asbtract ( 685 )

PDF (408KB) ( 1368 )

References | Related Articles | Metrics

The end-groups of the polymers formed in photopolymerization initiated by aromatic amines,such as aniline,were identified with electron and fluorescence-spectro-photometric methods. The spectra show the presence of secondary and tertiary amino end-groups in the polymers formed with primary and secondary amine as initiators,respectively. These results suggest that the nitrogen radicals of the aromatic (primary and secondary amines,which were produced from the proton transfer in the exciplexes between amines and vinyl monomers,are also responsible for the initiation.

SOLVENT EFFECTS IN 9,10-DICYANOANTHRACENE SENSITIZED PHOTOOXYGENATIONS

ZHANG BAO-WEN, CHEN JIAN-XIN, CAO YI

1986, 4(2): 56-61. DOI: 10.7517/j.issn.1674-0475.1986.02.56

Asbtract ( 677 )

PDF (391KB) ( 1168 )

References | Related Articles | Metrics

Based on the results of the determination of the relative quantum yields and the content of ¹O₂ products of α and β-pinene and 1,4-diphenyl-1,3-butadiene in a series of solvents and the analysis of the kinetics of the reaction of β-pinene,the solvent effects were discussed. Solvent polarity,solvent viscosity give the identical influence upon both DCA-sensitized (photooxygenation and the fluorescence quenching rate constants of DCA. For weak electron donors,α and β-pinene,the relative quantum yields (φ_r) of their photooxygenation which are the same as their k_q values depend obviously on solvent polarity. And also similar to kq values,the main factor which influences φ_r for strong electron donor,1,4-diphenyl-1,3-butadiene,is the solvent viscosity. It may be concluded that electron transfer mechanism is operating in DCA-sensitized photooxygenation including ¹O₂ products formation.

1986, 4(2): 62-64. DOI: 10.7517/j.issn.1674-0475.1986.02.62

Asbtract ( 668 )

PDF (176KB) ( 1138 )

References | Related Articles | Metrics

Table of Content