Px EUV_FEL õðp¢½ªqÌñü`õwßö²¡ÄmCâèjC«ìFÆCRà

§113_0033 s¶æ{½ 7_3_1åwåw@wn¤È»wêUv|O­x EUV_FEL õðfªqiN2j¨æÑ^m[iCH3OH, CD3OHjCG^m[iC2H5OHjÉÆËµ½Æ±ëC½õqCI»ÆÆàÉlXÈð£@\ªUN³êé±Æª¾ç©ÆÈÁ½B

1. ­xÉZg·õ¹ÉæéªqÈwgÌ m/z14tßÌgå}ð Fig. 1(b)É¦µ½BTChs[NÆµÄo³ê½ N{ ÍCñdCI»³ê½ N2

É[OiEUVjÉg·æðàÂ©Rdq[U[ÌN[­ÉæÁÄ¶¶½àÌÅéBêûCm/zEUV_FEL ÌoêÉæÁÄ1,2) C´qCªqCNX^[

14ÌÉÊu·és[N¨æÑCúo^®ÊGlÉÂ¢ÄCEUV ÌæÌñü`»ÛÌÏªªñ³êéæ{{M[Ì¬³Ès[NÍCN2{2 ¨æÑ N2 ¨N{N Ìð£¤ÉÈÁÄ«½3_6) BªqÉPxZg·õðÆË·éßöÉR·éàÌÅéBg·50.3 nm Ìõðp¢½êÆCªqªCI»·é¾¯ÅÈ­CªqàÌU®^®ÌãNâC»êÉº¤»wÌð£âgÝ·¦ªUN³ê
¾éBÜ½C2 õqÈãÌzûÉº¢C½¿CI¶¬àÂ\ÆÈèCN[­ðºÁ½ð£ªUN³êéBá¦ÎCfªqiN2 jÌêC50`60 nm Ìg·ÌæÅÍC1 õqzûÉæéCI»½fÊÏªå«¢
2{ ÌCIãÉC2 õqßöÉæÁÄ N2{2 C3 õqßöÅ N»lÉB·é½ßC½õqzûÉæéCI»ßöâ»êÉº¤ð£ßöÌ¤ÆµÄKµ½ÎÛÅ
½C^m[âG^m[ÈÇÌY»éBÜfªqÌêÉÍC»Ì½­ÍC»ÌCI»|eVª10 eV öxÅèCî X üÌæÌõÆËÉæÁÄCãNóÔðoRµ½íXÌð£«CI»ªmF³êÄ¢éB»ÌlÈCI»âCI»Éº¤ð£½ÉÖ·é¤ªsÈíêÄ«½àÌÌ7,8) C»êçÌ¤ÍC¢¸êà 1 õqzûÉº¤ü`»ÛÉÂ¢ÄÌàÌÅéBäXÍCSCSS ðõ¹ÆµÄC­xÌ EUV õi50`
61 nm, 20`25 eVjÉæéCfªqC^m[¨æÑG^m[ÌõCI»C¨æÑC»êÉø«±­ð£ßöðÏª·é±ÆðÝ½5,9)B

2. N2 ªqÌ½õq½dCI»Æð£ßö
g·50.3 nm Ì EUV õð N2 ªqÉÆËµ½êÉ¾
çê½òsÔ^¿ÊiTOFjXyNgð Fig. 1(a)É¦·B}Ì m/z14É N{ ªTChs[NðºÁÄÏª³
ê½B±êÍCð£ßöÉ¨¢ÄCTOF ²ÉÁÄoíûü¨æÑC»êÆÍ½ÎûüÌ^®ÊðàÁÄtOgCIª¶¬µ½±Æð¦µÄ¢éBTOF XyNFig. 1.

(a) The TOF mass spectrum of ion species generated fromFEL light at 50.3 nm. (b)N2 after the irradiation of EUV_The momentum scaled TOF mass spectrum of N{ in theregion around m/z14 in (a). The N2 sample gas was in­troduced into the vacuum chamber through a pulsed valve,and skimmed by a skimmer (0.5 mmq) to form a molecularbeam. The EUV light was focused onto the molecular beam
by a SiC concave mirror. The light eld intensity at the focal
point was estimated to be 3~1014 W/cm2 by assuming thatthe pulse duration and the focal spot diameter were 100 fs
and 4 mm, respectively.

úËõ Sept. 2010 Vol.23 No.5  295(C) 2010 The Japanese Society for Synchrotron Radiation ResearchCN2{ ¨æÑ N2{2 ª¶¬·é½ßÉÍC2 õqÈãÌ{zûªKvÆÈéBÜ½CN{
2 ¨N{N Ìð£ßöÍ 1 õqzûÉæÁÄàGlM[IÉÍÂ\ÅéBFig. 1(b)ÌlpÌgàÉ¦µ½TChs[Ni^®Ê75_110~103amu m/sjÌCIVOiÌÊð N2{ ÌVOiÌÊÅÁ½lðCN{2 ÌVOiÌÊð¡²ÆµÄvbgµ½Æ±ëCñÌñü`«ð¦µ½BN{2 ÌVOiÍ
1 õqÅ¶¬·é±Æ©çCTChs[NÍCEUV_FELõÌ 2 õqzûÉºÁÄ¶¬µ½àÌÅé±Æª¦³ê½B
Ü½CFig. 1(a)Ì m/z7 É¨¯é N2{ Ìs[Nà 2{Ìªôµ½s[NÆµÄÏª³êÄ¢éB±êÍCN2{22{ {NªCN2{2 ¨N2{ {N{ ÌN[é¢Í N3{2 ¨N­ÌßöÅ¶¬µ½àÌÅé±Æð¦µÄ¢éB±êçÌßöªN±é½ßÉÍCg·50.3 nm Ìõª 3 õqÈãzû³êéKvªé±Æ©çCN2 ªqª EUV õð 3Fig. 2.

õqÈãzûµ½±ÆªmF³ê½B3. ^m[ÌCI»Éº¤ªqàf}CO[VÆð£½
3.1f}CO[VÌÏªThe TOF mass spectra of ion species generated from (a)CH3OH and (b) CD3OH after the irradiation of EUV_FELlight at 51 nm, and from (c) CD3OH at 61 nm. The lighteld intensities at the focal point were estimated to be `5~1013 W/cm2 at 51 nm and `1.0~1014 W/cm2 at 61 nm byassuming that the pulse duration and the focal spot diameter
were 100 fs and 6 mm, respectively.

ÌûÊÌõ­xË¶«ð²×½Æ±ëC»ÌÍ2.1}

g·51 nm Ì FEL õÉæÁÄ^m[ðCI»µ½Æ±ëCCHnO{ (n0`4), HnO{ (n0`3), CH{n (n0.2ÆÈÁ½B±Ì±Æ©çCCH2OH2{ (CD2OH2{ ) ª 2
õqzûÉºÁÄ¶¬µ½àÌÅé±ÆªmF³ê½B2, 3), H{ ª TOF XyNgÉÏª³ê½BFig. 2 ÉCm/z10`22ÌÌæÌ TOF XyNgð¦µ½B}ÉC
H2O{, H3O{ ª m/z18, 19ÉÏª³êÄ¢éB±Ì±ÆÍ CH3OH Ì`î¤Ì H ´qÌ¤¿ 1 Â3.3CO ÌØfÉÆàÈÁÄ¶¬µ½CIíFig. 2(c)ÉÍC¡Ì C_H ªØf³ê½ CD{ (m/zé¢Í 214), C{ (m/z12) ªÏª³êÄ¢éBßÌÀ±©

Âª OH î¤ÉÚ®µ½ãÉCC_O ªØf³ê½±{
çCCI»Æ C_O ð£ðº¤ CH{3 , CH2 Ìo»GÆð¦µÄ¢éBCD3OH ÌêCHOD{ ¨æÑ HOD{2lM[ÍÆàÉ13.5 eV ÅÌs[Nª m/z19, 21É»ê¼êÏª³ê½B±ÌÊ M [ Í » ê ¼ ê 27 eV C 29 eV ö x Æ ñ  ³ ê Ä ¢Í`î¤Ì D Ì¤¿ 1 Âé¢Í 2 Âª OH î¤Éé13)Bg·51 nmC¨æÑ61 nm Ì 1 õqÌGlM[ÅÚ®µ½ãÉ C_O ªØfµ½±Æð¦µÄ¢éBß

ÍCCH{, C{ Ìo»GlM[ÉB·é±ÆÍÅ«È¢ÔOæÌ­[U[êÉ¨¢ÄCY»fª±Æ©çC1 õqzûÉº¤ð£½ÌÊÆµÄC´¬Å} CO[V ßöÉ Â¢ÄÍ· ÅÉñ{CH{
3 , CH2 ª¶¬µC»ÌãC¯¶pXàÅà¤ 1 õéªC±êÍCEUV_FEL õÉæÁÄUN³ê2{qðzûµÄ CH2{
3 , CH2 ª¶¬µ½ãÉN[­á11) ª½fªqàÌf}CO[VßöÌßÄÌÏªáÅéBÉæÁÄ¶¬C

èCCH{, C{ Ìo»Gl{é¢ÍCCH2{2 , CH3 ÌdqãNóÔª¶¬µ½ãCH ÌiKIÈE£ÉæÁÄ CH{, C{ ª¶¬3.22 ¿CIÌÏªµ½Æl¦çêéB

Fig. 2(a)Ì m/z15.5ÉÍ 2 ¿CI CH2OH2{ img·61 nm ÌêÉ C{ ÌûÊÌõ­xË¶«ð²×½

31jªÏª³ê½BÜ½CCD3OH ÅÍCm/z15.5¨{Æ±ëCª1.9}0.7ÆÈÁ½BêûCCH{3 iCD3 jÌæÑ m/z16.5ÉCCD3OH ©ç D ª 1 ¨æÑ 2 ÂE£µÍ0.9}0.2ÆÈÁ½B±Æ©çCC{ Í 2 õqßö½ 2 ¿CIÌs[NªÏª³ê½BÜ½C`î©

ÉæÁÄCÜ½CCH{{ Í 1 õqßöÉæÁÄ¶¬³ê½ç H ª 1 ÂE£µ½ 2 ¿CIiCH2OH2{jªÀèÅ±ÆªCõ­xË¶«©çàmF³ê½Bé±Æª_vZ12) ©ç\ª³êC»Ìo»GlM[ÍdqÕËÀ±12)©ç32.9 eV ÆßçêÄ¢éBFEL õÌGlM[Í24.3 eV ÅéÌÅCCH2OH2{ Í 2 õqzûÆ»êÉº¤ H ´qÌúoÌÊÆµÄ¶¬³ê½àÌÅ

éBg·61 nm ÌêÉ CH2OH2{ (CD2OH2{ )296  úËõ Sept. 2010 Vol.23 No.5

EUV SASE_FEL pÌWJ ¡ Px EUV_FEL õðp¢½ªqÌñü`õwßö½ B ± ê Í 2 õ q z û Ì ã É ¶ ¬ µ ½ C2HnOH2{ ª CN[­ðN±µ½ÊÆµÄ¶¬µ½àÌÅéB

5. ÜÆßEUV_FELiSCSS ±Á¬íjÉæé­x EUV õðfªqiN2j¨æÑ^m[iCH3OH, CD3OHjCG^m[iC2H5OHjÉÆËµC½õqzûÉº¢C½¿ªqCIª¶¬·éÆàÉlXÈð£ßöªUN³ê
é±Æð¾ç©Éµ½B
Ó«{¤Í¶ÈwÈ X ü©Rdq[U[pi¤ÉæÁÄs³ê½àÌÅ
Fig. 3.

The TOF mass spectra of ion species generated from C2H5
OH obtained after the irradiation of EUV_FEL light at (a)51 nm and (b) 61 nm.

èC¤ X ü©Rdq

[U[væ¯i{pO[vÆÌ¤¯¤ÆµÄsíê½àÌÅ

éB{À±ÌsÉ½èCpi¤ ÛèÌ¤ ¯¤Æµ Ä²¦Íð¸ ¢½öº¾ æ¶iKEKjC_¬¶Fæ¶icåjCRìlêæ¶CÂR½4. G^m[Ì 2 ¿CI»Æð£«CI»_Ci~NXmiJAEAjCÎìüæ¶CçìNvmC´h¡mi¤jCìGræ¶iNTTjC»w¤ XFELvæ¯i{Ì¤õC^]õCX^btÌFlÉ±Fig. 3(a), (b)É51 nmi24.3 eVj¨æÑC61 nmi20.3

Ìêð¨ØèµÄ´Ó\µã°éBeVjÌ EUV õðÆËµÄ¾çê½ TOF ¿ÊXyNg
ð¦·Bg·61 nm ÌêÌ¿ÊXyNgÉÍCC2{HnO{ (n0`6), CHnO{ (n0`4), C2H{n (n0`5), Hn{(n0`3), CH{n (n0`3), Hn (n1`3) ªÏª³ê½B¿ÊXyNgÉ©o³êéæ¤ÉCC2H2OH2{im/z21.5jªÏª ³êÄ¢éB_ vZ12) ©çà C2H2OH2{ Í 2 ¿ÅàÀè\¢ðÂÆñ³êÄ¢éBC2H2OH2{ Ìo»GlM[ÍdqÕËÀ±12)ÉæêÎ33.3eV Æñ³êÄ¢éB]ÁÄCC2H2OH2{ Ì¶¬ÉÍU®ãNóÔðoRµ½iKIÈ 2 õq 2 dCI»CÜ½ÍC2 õqzûÉæé¼Ú 2 dCI»ÉæéàÌÆl
¦çêéB
{{Fig. 3(b)ÅÍ CH{2 (m/z14), CH3 (m/z15), OHn ,{CnH{m , CHnO Ìs[NÉ¨¢ÄTChs[NªÏª³êQl¶£1) W. Ackermann, et al.: Nature Photonics 1, 336 (2007).
2) T. Shintake, et al.: Nature Photonics 2, 555 (2008).
3) á¦ÎCH. Wabnitz, et al.: Nature 420, 482 (2002).
4. A. A. Sorokin, et al.: Phys. Rev. Lett. 99, 213002 (2007).
5) T. Sato, et al.: Appl. Phys. Lett. 96, 154103 (2008).
6) H. Fukuzawa, et al.: Phys. Rev. A 79, 031201 (2009).
7) F. Dong, et al.: J. Chem. Phys. 124, 224319 (2006).
8) J. H. D. Eland and B. J. Treves­Brown: Int. J. Mass. Spec­
trom. 113, 167 (1992).
9) T. Sato, et al.: Rev. Laser Eng. 37, 905 (2009).
10) A. S. Mullin, et al.: J. Chem. Phys. 96, 3636 (1992).
11) T. Okino, et al.: Chem. Phys. Lett. 423, 220 (2006).
12) L. A. Teleshefsky, et al.: Org. Mass. Spectrom. 17, 281(1982).
13) G. R. Burton, et al.: Chem. Phys. 167, 349 (1992).

úËõ Sept. 2010 Vol.23 No.5  297 ÒÐî ²¡Ämåwåw@wn¤È»wêUYw¯Ag¤õE­mail: tsatochem.s.u­tokyo.ac.jpêåF[U[HwC­õqêÈwmªðn
2004NåãåwHwdqîñGlM[HwÈ²C2006N¯åw@Hw¤È´qÍHwêUmOúÛöC¹C
2006N¯åw@Hw¤ÈdCdqîñHwêUmãúÛöÞC2007N
æè»EB
­xÉZg· FEL õÉ¨¯éªq_Ci~NXÉÖ·é¤É]Bâèjåwåw@wn¤ÈÁC³E­mail: aiwasakichem.s.u­tokyo.ac.jpêåF¨»wC[U[ªõmªðn
1995Nkåww»wÈ²C2001Nåwåw@wn¤È»wêUmÛöPÊæ¾ÞwBmiwjC
2000N_2001Nú{wpU»ïÁÊ¤
õC2001NJi_PxbNB Laval åwm¤õðoÄC2007Næè»EBõÈwªìÌYwÔAg³ç¨æÑ´qÉªqõÈwÌ¤É]B«ìFÆåwåw@wn¤È»wêU³E­mail: tokinochem.s.u­tokyo.ac.jpêåF¨»wC­õqêÈwmªðn
2002Nåww»wÈ²C2004
N¯åw@wn¤È»wêUCmÛ
öC¹C2006N¯mÛöÞC¯Nåwåw@wn¤È»wêU
èC2007Næè»EBmiwjB­[U[êÉ¨¯éªq_Ci~NXÉÖ·é¤É]BRàO

åwåw@wn¤È»wêU³öE­mail: kaoruchem.s.u­tokyo.ac.jpêåF¨»wC­õqêÈwmªðn
1981 N   å w  w  » w È ² Æ C
1986N¯åwwmC1985Nåw³{wîbÈwÈæêèC»ÌãC¯åw@¶»¤ÈLæÈwêU³öðoÄC1997Næè»EB¨»wC­õqêÈwÉÖ·é¤É]B

Non­linear optical processes of molecules inducedby intense EUV_FEL light
Takahiro SATO, Atsushi IWASAKI, Tomoya OKINO, Kaoru YAMANOUCHI
Department of Chemistry, School of Science, The University of Tokyo
7_3_1 Hongo, Bunkyo­ku Tokyo 113_0033, Japan

Abstract By irradiating nitrogen (N2), methanol (CH3OH, CD3OH) and ethanol (C2H5OH) molecules withintense EUV_FEL light, we conrmed that a variety of dissociation processes are induced associated with theformation of multiphoton ionization.

298  úËõ Sept. 2010 Vol.23 No.5