H

hg -derived band (see also Electronic structure), 521, 522 Hg-derived mode (see also Vibrational modes), 378, 643 /(„-derived band (see also Electronic structure), 437, 441, 448, 451, 453, 456, 501, 518, 522 Hagen-Rubens extrapolation, 529, 530 "Hairy ball," 296

Hall effect (see also Transport properties), 580-581, 608 connection to Seebeck coefficient, 581 sign change, 580, 581 temperature dependence, 580 Halogens, 256-258, 306-307, 451 bromine, 258, 451 QoBr,,, 305, 307 CwBr8, 307 QoBr24> 296> 307 chlorine, 451 QoCl,,, 307 fluorine, 314, 906 OA, 307 C^F^, 296, 307, 906 iodine, 236, 256-258, 664, 665 C^l,, 257, 664, 665 C«,!,, 256, 257, 586 Qolx. 236 C70I2, 258

Hamiltonian (see also Hubbard model), 419-424, 456, 471, 646, 669, 701, 740 hyperfine interaction, 669 icosahedral perturbation, 419 many-electron, 421, 422 phenomenological, 421, 422 ring currents, 740 Health and safety issues, 111, 114, 115, 117, 138

Hardness (see Mechanical hardness) Heat capacity (see Specific heat) Heat of formation, 63, 68, 560 Heat treatment temperature, 20, 24, 25, 27,

287, 531, 592, 765, 782, 851 Hebel-Slichter peak (see also NMR), 636,

637, 666, 684 Heptagon-pentagon (7,5) pair, 144-147, 775, 783, 788

Heptagons, 65, 144-147, 772-774, 788

Herzberg-Teller vibronie states (see Optical properties) Heterojunctions diodes, 871, 873, 880, 881, 884, 885 Nb/Qo/p-Si, 884-886 Ti/Qo/p-Si, 884, 885 photovoltaic devices, 886-888 polymer-Qo composite rectifiers, 884-886 Hexagonal close packed (hep) structure, 50,

85, 198-202, 233, 598, 714 High pressure, 15, 16, 31, 175, 403, 587 catalytic reactions, 899 chromatography, 907 High temperature, 15, 16, 31, 36, 37, 175 Highly oriented pyrolytic graphite (HOPG), 20, 21, 157, 164, 713, 714, 851, 853, 854 Hildebrand solubility parameter, 120, 121 Hindered rotation, 259, 329, 657, 749 History, 1-14, 49, 80, 111-112, 122, 228 astronomical observations, 3 architectural analogs, 4 biological and geological examples, 5 carbon cluster studies, 3, 111 carbon nanotubes, 761-764 early history, 1 physical interest, 7 production techniques, 6, 111, 112 recent, 6, 111, 112 superconducting properties, 617 HOMO (highest occupied molecular orbital), 3, 93-95, 229, 233, 413, 416-420, 425-428, 432-435, 438-441, 451, 453, 469, 470, 472, 473, 476-478, 480, 501, 518, 693, 721, 728, 744, 745 Cm on surfaces, 721, 728 CJf ions, 425-428, 518, 744-745 doped COT, 584

higher mass fullerenes, 432-435, 536-540 HOMO-LUMO gap, 73, 418, 425, 432, 435, 438-439, 441, 453, 457, 476, 504, 537, 539, 540, 593, 691, 693, 694, 701, 706

HOMO-1, 508-510

molecular C«,, 300, 430, 438-440, 453-455, 457, 469, 470, 473, 476-478, 480, 593, 691, 693, 694, 697 phototransformed Cm, 508-510 Honeycomb lattice, 74, 76, 757-760, 774,

776, 111, 792, 803, 806 Hopping, 25, 541, 563, 579, 586, 592, 593, 608, 749

Host-guest complex, 316-320 Qo-hydroquinone, 316, 317 Cm-y cyclodextrin, 317, 318 Qo-calixarenes, 317-319 Qo-ferrocene, 319, 320 C70-calixarenes, 317-319 HREELS (high resolution electron energy loss spectroscopy) (see also EELS), 279, 357, 359, 360, 369-370, 387, 388, 499, 702, 706, 717, 724, 726 Hubbard model, 456-457, 644, 646-648 Hermitian conjugate, 646 Hubbard U, 438, 455-457, 556, 558, 561, 646-647, 689, 691, 693, 696, 708, 711 Hiickel theory (see Electronic structure) Hund's rule, 94-96, 417, 424-428, 434, 739,

742-745, 748 Hydrogen, 296 hydrides, 898, 900, 911 impurities, 43 storage, 898, 899-901, 911 Hydrogénation (see Chemical reactions) Hydrophilic, 281, 282, 889, 890, 897, 900 Hydrophobic, 281-283 Hyperfine structure (see also Rotational spectra, EPR), 137, 229, 230, 344, 345, 424, 428, 663-665, 669-672, 745 Hysteresis (see also Phase transitions), 197, 597, 750-753

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