DIRECT OBSERVATION OF TRANSITION FROM DELAYED IONIZATION TO DIRECT IONIZATION FOR FREE C-60 AND C-70 - THERMIONIC EMISSION

被引：56

作者：

ZHANG, Y ^{[1
]}

STUKE, M ^{[1
]}

机构：

[1] MAX PLANCK INST BIOPHYS CHEM, W-3400 GOTTINGEN, GERMANY

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 70卷 / 21期

关键词：

D O I：

10.1103/PhysRevLett.70.3231

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Transition from direct ionization to delayed ionization for free C60 and C70 is observed below the ionization potential (IP = 7.5 eV). It depends on the excitation wavelength as well as the pulse energy. The appearance threshold for direct ionization is found at approximately 5.8 eV. These can hardly be explained by thermionic emission; therefore, we propose that triplet states at approximately 1.7 eV (= 7.5 - 5.8 eV) should play an important role in the multiphoton ionization of free C60 and C70 and the intramolecular interaction of many triplet states gives rise to delayed ionization. To confirm our proposition, we have carried out further experiments using two laser ionization.

引用

页码：3231 / 3234

页数：4

共 26 条

[1] MULTIPHOTON EXCITATION, IONIZATION, AND DISSOCIATION DECAY DYNAMICS OF SMALL CLUSTERS OF NIOBIUM, TANTALUM, AND TUNGSTEN - TIME-RESOLVED THERMIONIC EMISSION [J].

AMREIN, A ;

SIMPSON, R ;

HACKETT, P .

JOURNAL OF CHEMICAL PHYSICS, 1991, 95 (03) :1781-1800

[2] IONIZATION OF MOLECULES AT LOW ENERGIES [J].

BERRY, RS .

JOURNAL OF CHEMICAL PHYSICS, 1966, 45 (04) :1228-&

[3] ABSOLUTE ABSORPTION CROSS-SECTIONS OF GAS-PHASE C-60 AT 600-DEGREES-C [J].

BRADY, BB ;

BEITING, EJ .

JOURNAL OF CHEMICAL PHYSICS, 1992, 97 (05) :3855-3856

[4] DELAYED IONIZATION OF C60 AND C70 [J].

CAMPBELL, EEB ;

ULMER, G ;

HERTEL, IV .

PHYSICAL REVIEW LETTERS, 1991, 67 (15) :1986-1988

[5] THERMIONIC EMISSION FROM THE FULLERENES [J].

CAMPBELL, EEB ;

ULMER, G ;

HERTEL, IV .

ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS, 1992, 24 (01) :81-85

[6] EXCITON-EXCITON INTERACTIONS AND PHOTOCONDUCTIVITY IN ORGANIC CRYSTALS [J].

CHOI, S ;

RICE, SA .

PHYSICAL REVIEW LETTERS, 1962, 8 (10) :410-&

[7] METASTABLE DECAY OF PHOTOIONIZED NIOBIUM CLUSTERS - CLUSTERS WITHIN A CLUSTER [J].

COLE, SK ;

LIU, K .

JOURNAL OF CHEMICAL PHYSICS, 1988, 89 (02) :780-789

[8] DELAYED IONIZATION FOLLOWING RESONANT PHOTON-ABSORPTION AND INTRACLUSTER ELECTRON-TRANSFER [J].

DAO, PD ;

CASTLEMAN, AW .

JOURNAL OF CHEMICAL PHYSICS, 1986, 84 (03) :1435-1442

[9] FULLERENE TRIPLET-STATE PRODUCTION AND DECAY - R2PI PROBES OF C60 AND C70 IN A SUPERSONIC BEAM [J].

HAUFLER, RE ;

WANG, LS ;

CHIBANTE, LPF ;

JIN, CM ;

CONCEICAO, J ;

CHAI, Y ;

SMALLEY, RE .

CHEMICAL PHYSICS LETTERS, 1991, 179 (5-6) :449-454

[10] GIANT PLASMON EXCITATION IN FREE C-60 AND C-70 MOLECULES STUDIED BY PHOTOIONIZATION [J].

HERTEL, IV ;

STEGER, H ;

DEVRIES, J ;

WEISSER, B ;

MENZEL, C ;

KAMKE, B ;

KAMKE, W .

PHYSICAL REVIEW LETTERS, 1992, 68 (06) :784-787

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